I badly want this, but with Topre keys. I have a couple of Topre FC660Cs and absolutely love the feel, durability and quality of the keyboard. A split would be really nice though.
I'm with you. I have the FC660C. Loved the feel and sound, but the tiny form caused my RSI, which prompted me to buy an ErgoDox EZ. Had to go back to Cherry switches, but I would love some CYO Topre switches to throw in there. I wish there was a bigger market for CYO switches, but I haven't found anywhere to get them.
I wouldn't hold my breath on the Topre front, the company is notoriously conservative in their offerings. They're also not mechanical switches; there's really no way to offer hotswap Topre switches. But there is a whole world out there other than Topre and Cherry. And you can swap them out easily since you have an ergodox ez. You can buy mechanical switches from several hobby sites like https://novelkeys.xyz/collections/switches, it's pretty much plug and play