You didn’t mention how you will mix the outputs of the two effects units and any untreated instruments, unless you intend to only be using one instrument and one effects box at any time.
For maximum effectiveness from a patchbay (to prevent switching cables), you need as many inputs and outputs as your gear has inputs and outputs.
Your chosen gear has 10 main inputs, and 8 main outputs, because you appear to be spurning the individual outs on the AR and the Cue outputs on the OT. I strongly recommend that you include the Cue outs on the OT in your plans. Therefore you would likely want a patch bay with at least 10 inputs and 10 outputs.
Note that by losing your mixer, you would be losing a LOT of flexibility in routing because you do not have the aux busses that it provides.
Is there any possibility that you can keep the mixer in your space?
I used to have a small setup using a Shure Auxpander matrix mixer to route any of four groovebox-style instruments and effects units to any other. I don’t use the Auxpander any more, so I will be selling one or two of those soon.
In my current setup, all outputs from MM, MD, and OT go to patchbays, with the main outputs semi-normalled to input channels on my mixer. The aux sends and returns on the mixer are also routed to the patchbays for maximum flexibility.