Hi!
I don’t have a bottom module I could spare, but maybe this could be interesting for you:
Summary: Leo_TheCrafter is building bottom modules with new microphone and USB C (instead of micro USB as the original FP2 bottom module). You’d have to reuse the vibration motor and speaker from your existing module (i.e., a bit of handiwork is required), and either get a case adopted for the USB C plug (making it a more expensive option than just the bottom module), or cutting the original case (which requires careful handiwork from what I’ve read).