If you get the type of board where you add in your own microcontroller, you could replace a pro micro with a nice!nano. I don't know how common that is on non-split keyboards, though.

What about the Keychron Q Pro series?

If you want low latency comparable to wired keyboards, it's impossible.

It's certainly possible, if you're like me and have separate setups for work and gaming you could definitely rig up a Bluetooth dongle for a "work" keyboard. Some boards may allow you to do some more elegant modding compared to others so ymmv.