I was warned by a colleague that this was a rabbit hole, then warned by people online, and I'll pass on that warning now.

I tried to help by updating and better-presenting an existing list of ergonomic mechanical keyboards: https://aposymbiont.github.io/split-keyboards/

I'm using an ErgoDash¹ with a 3D-printed tilted stand, but I intend to assemble a Lagrange² "soon".

¹ https://github.com/omkbd/ErgoDash

² https://github.com/dpapavas/lagrange-keyboard