There's quite a lot of choice for split keyboards out there - one of my favorites being the Corneish Zen by lowprokb - just two small boards, wireless interconnect. I made it a unibody design on purpose - better battery life, and only one device I have to charge and remember bringing along with me. And the fact that there is a pretty limited amount of existing designs in that style.
ZMK firmware can as of now sadly not do wired connections between two halves, so it's either wired connection and wired connection to PC (QMK firmware) or full wireless like the Zen, with ZMK.
ZMK firmware can as of now sadly not do wired connections between two halves, so it's either wired connection and wired connection to PC (QMK firmware) or full wireless like the Zen, with ZMK.