Hi @CardiacTasty. I've sort of built my rack around the idea of performing improvisational minimal techno mainly using an Arpitecht and Eloquencer switching with an Acid Rain Switchblade (though I have other sequencers and utilities, and record other types of music too). I chose the Eloquencer over the Metron for the exact reason that you are describing here. I've also added a Behringer RD8 808 clone to trigger additional modular drum voices via the three trigger outs, so an external X0X style drum machine is always valuable, but you already have that functionality with the Metron. I've found the Arpitecht to be fun but not precise in getting exactly what I want, so you could probably use two but I think you'll find it similarly clunky to what you are doing now. I would recommend doing a lot of research on sequencers to pick one that does exactly what you need it to do, and use the Arpitecht as a supplement.
As always, yes... get a bigger case. Haha.
Have fun and good luck.
Here's a good video for your consideration: