That’s the thing: Elektron boxes absolutely will pattern change at the right moment when triggered by a non-elektron. The question you should be asking yourself is, “for this device, what is the ‘right moment’?”
When is the right moment to trigger a pattern change on an Elektron sequencer playing another pattern? A beat or two before the current pattern reaches the end of its loop. Send the PC then (again, exactly when you’d normally press the button yourself if playing live) and you will have no problems whether your sequencer is made by Korg or Squarp or whomever.
Now maybe you don’t like the way Elektron queues up pattern changes like this? Maybe you feel it’s a shame that they don’t all have the Direct Start and Direct Jump modes of the A4, for example? That seems a reasonable thing to want from a 700€ box! But it has nothing to do with MIDI or bugs or manufacturer lock in.
And you’d have better luck asking for that feature you wish it had rather than insisting they fix something they clearly don’t even think is broken