Consider my recent design, which I'm still looking into producing in some form. . .

https://www.reddit.com/r/MechanicalKeyboards/comments/xty653/refactored_fullsize_worth_pursuing/

Mine is a bit more radical with the split spacebar and split backspace, which I am a believer in. However, it can still be completely covered with a recent GMK or NicePBT keycap set.

Note also. . . The main alphanumeric key block is fully functional, so there could be a more portable "mini" version with just that part, and it would be possible to switch between the mini and full-sized versions without any adaptation or retraining.