[Symbiote]

There are several iterations on the Ergodox design, and a comparison tool for many split keyboard layouts is here [1].

Using a similar approach (before that website existed), I decided on an Ergodash[2], which I bought as a kit, but is also available assembled. The first and second thumb keys are easy to reach (I have them as Backspace, Ctrl, Enter/Ctrl, Space) but the outermost ones are too far away. I have these as a sort-of "Fn"/"Windows" key. I still thing it's useful to have the extra keys, since it gives me more options without having to learn too many multi-key combinations.

[1] https://jhelvy.shinyapps.io/splitkbcompare/

[2] https://github.com/omkbd/ErgoDash