I wish someone would make a wireless split keyboard. I have the ergodox but I ended up replacing it with the logitech mx keys because I was sick of having cables all over my desk and having to unplug the thing every time I switch between my desktop and laptop.
You can definitely build your own. I think one hurdle is that the ZMK firmware (like QMK, but supports Bluetooth) is a little immature. (I could be very wrong.)
I’ve seen plenty in r/ergomechkeyboards. If someone made a wireless Moonlander, insta-buy from me!
Interesting product. Little bit ugly but it does seem to be what I wanted. I actually had a usb switch setup going on but the problem was I had cables everywhere and still had to plug everything in to the laptop. Now I just plug in power and video and the rest is just wireless.