Aren’t the Ergodoxen already two separate units it is there a cable limitation? I was looking at buying one or a similar split keyboard for the reason you stated.
The Ergodox EZ is connected by a replaceable standard 3.5mm (male to male) cable; I presume most ergodoxes are the same.
They are and that works fine, but the infinity has a really bad case that I had to modify just to stop it sliding around on my desk. Also I had one from the bad batch whose USB ports would occasionally rip off the board taking its traces with it (and mine did)