I was wondering if it'd be possible to go further, and actually use it as a fully fledged keyboard, but with your choice of switches and mechanical layout... and turns out that somebody has been doing that already! basically reverse-engineering the matrix and hooking up your own switches to the logic board. You get TouchID, pretty good BT performance and integration in the Apple ecosystem, good battery life, ... and all in a single device.
Found it in a forum post here: https://geekhack.org/index.php?topic=120964.0