Technically not an ergo board, but in it's current setup I'm using it as a one handed gamepad. That makes it ergo, right?
After a year off from gaming, I've been itching to play. While designing some sort of gamepad, I realized I had basically already designed what I was wanting - Chaz.
After tossing ZMK and an adjusted keymap on it, I think it'll work well enough while I think about what I really want in a gamepad. If, for some godawful reason, you want one of these - I've got a few kits up on my site or if you think you want five of this abomination, it's Open Source.
This is similar to a "Minecraft layer" I added to my last split ergo keyboard. I got all the keys I needed on to the left half. I did it by making a second row of numbers across the top and moving the other rows down. Seeing the number pad on the right here makes me wonder if I should try that design instead.