Mackie 402VLZ4 should do the job. I bought mine for a similar but slightly different purpose: to add outputs for my camera and headphones in addition to monitors. It is also good for setting a maximum output level.
I would definitely get a mixer or an audio interface.
The problem would be if a hot click or some wild bass frequencies might blow the speaker. Not in a dramatically way either. Just in a sec, it would stop working.
Plus, you’re in the game now. Time to just get the right equipment from the jump. Why compromise now?
You can yes. I am guilty of doing it more than I can count, just plugging the leads in and jamming on my DT. Just gotta keep that master level down. Cant forget that doing things like browsing sounds or nerding out on resonant frequencies can easily cause damage.
Recommended to use a mixer, but not needed if your budget is too tight at the moment.
Just get a cheap Mackie mixer. I use one and its great. I would not go direct to your speakers unless you want to risk blowing them
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Some monitors have a built in protection circuit but also you will probably want a mixer down the line anyways.
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Yes, it’s being overthunk. I have no issues hooking my Elektron devices to monitors.
I run a Monomachine off a set of KRK-RP5s when I’m not using headphones.
Speakers getting “fried from the input signal alone, even if no sound at all” sounds more an issue of a burnt voice coil from extremely low sub-frequencies not filtered from a source.
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Practically speaking, there is no reason not to hook a “line level” source up to a powered speaker. But you must adhere to standard practice of adjusting gain on the speaker and master volume on the source. If you are planning on abandoning this simple process you won’t blow out any legit speakers with a line level signal, but it won’t sound good.
Thinking of n terms of volume is not helpful either- this is different that a stereo. It’s about adjusting a signal strength as it passes though different processes. The only “volume” would be on the amplifier pushing the speakers. If your signalis coming in too hot, it will be distorted at any volume.
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I highly doubt your speakers will ever get fried from any authentic Elektron gear unless lightning somehow wraps itself around your home, sneaks in through the window, and kisses your gear directly. Even in that rare scenario I would be doubtful. Not even MD can destroy the Yamaha MX-5s I’ve had for over 10 years that have been directly plugged in to my MPCs/PC/Phone and were handed down to me by my Uncle who used them in his pizza shop. I recommend investing in some nice headphones instead, and getting used to those subtle differences between monitor playback/headphones out of your box. Don’t mean to sound angry towards you, btw! I’ve spent too much time researching and blowing up home stereo amps, from my own mods on turntables.
Don’t be afraid to try, and take all of the worrying info online with a grain of salt. 
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I have used a Digitone as an audio interface and mixer, plugged straight into speakers. Works great.
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you have described function of an audio limiter 
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my answer to the topic title: yes.
my 5 cents about mixers: anything can blow out monitors/headphones if you drive it loud, even mixers.
- set your active speakers gain to minimum
- set your elektron device to max volume you will use it at
- slowly raise speakers gain until you reach the loudest dB you want to hear
- set elektron volume back to normal/medium volume
If you get a mixer you would just have to do same thing, but with a mixer. Same for limiter, but with a limiter you will also destroy top end of dynamic range (it will still sound just as loud but clipped).
I use same approach with all my audio equipment; my goal is not saving speakers, but my ears.
Most monitors these days will blow out your ears way before blowing up themselves.
This is the safest method if you want to be care free, but from gain staging perspective its not good. I honestly dont see a reason to perfect signal to noise/distortion ratio for a home setup. As long as you are comfortable 
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Tried this once with my Digitone. Was insanely loud, even at the lowest(ish) volume. Don’t do it. Follow the advice to get a mixer
Without knowing the dBu level of step number two, I risk sending a signal that destroys my speakers here. I don’t know if I need a multimeter in order to check the voltage output from the cable here or something.
It has been said before. Possibly by me. But it bears repeating: You are drastically overthinking this.
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So, if I write to the manufacturers of my active speakers and ask them whether it poses any risk to constantly feed the speakers a signal of 19 dBu (and then simply raise the volume on the speakers itself so that I achieve the dB SPL that I want to have), you’re extremely sure that they will say that this is fine and that I won’t damage the speakers?
I would love for them to confirm that this is safe since then I would be able to stop thinking about it and just go on to making music instead 
27 days to hook up an Elektron to a speaker….
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The only thing I’m sure of is you are creating much ado about nothing. Use your hand to turn the volume to a reasonable level and get on with it.
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The master volume knob on my Elektron device?
Oh good lord. I’m sure you can deal with this.
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