Gregory's Server
It may sound a little geeky, but a few years ago I made a low-profile keyboard prototype.
The layout is too crowded and overall far from perfect, but the main showstopper was my inability to manufacture keycaps I would be satisfied with for those low-profile switches.
@abcdw I've seen a lot of people use this as a low-profile ergonomic keyboard https://kowodo.github.io/HardwareTools/gergoPlex.html