Exactly, I would suggest to start with Climate Monitor firmware and add the accelerometer to it.
It will work perfectly fine, just add the accelerometer init to the application_init function and copy&paste the accelerometer callback function with radio publish message. The radio is already initialized so it should be straightforward.
See this page how to start with firmware. Instead of bcf create you just clone the climate kit firmware using git clone....
https://developers.bigclown.com/firmware/firmware-quick-start