Still the Sculpt. And new ones are still sold, so it won't force your hand yet :)

I would next try some wired model, using wireless has only downsides in my setup. I've been checking some split mechanical models like the Kinesis Freestyle but not sure if I can go back to the long key travel of the mechanical models.

Someone in this comment section posted a link to a list of more esoteric keyboards, I'll have to go through that list at some point.

Agreed on the key travel, I know most keyboard enthusiasts refuse to use anything other than mechanical, but I've been through that and come out the other side preferring chiclet - it's just more gentle on the fingers, and imo more aesthetically pleasing.

For what it's worth, I've been through the DIY ergo board phase as well - I made a Corne (or Helidox as it was known then). It was a fun project, but the build quality just wasn't there which ruined it for me. The sculpt is still the closest I've got to my ideal board - good build quality (minus the F keys), relatively good ergonomics, and wireless. I was hoping the Microsoft surface ergonomic would solve the F key and dongle issue, but may have to rethink my plan.