I’ve had trouble with the battery in a wireless Keychron.

Have you looked into building your own keyboard or finding keyboards with replaceable mechanical switches?

I know you said 100%, but for example, in a quick search I found the Razer BlackWidow V4 75 has replaceable switches.

What I ended up getting was an ErgoDox EZ split keyboard. Before deciding on switches I bought a pack of switch samples from Amazon to see what I wanted. It was great to be able to configure the keyboard with the exact feel I wanted, and have the options of swapping if a switch breaks down or I want a different feel.

The fire fighting plane is the Canadair CL-415 (Super Scooper) – https://en.m.wikipedia.org/wiki/Canadair_CL-415

Plane getting water – https://m.youtube.com/watch?v=TLys5Wa7zhg

Plane dropping water – https://m.youtube.com/watch?v=2fH5kdShKNw