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 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