I would expect that the AD package itself is built from parts of the android source tree for the device in question. You don't have the source for the AD package so unless you're awesome at binary patching I'm not sure you will have much luck in your quest.

Also, the AD package from Jolla C is Android 4.4.4 where as the android for FP2 is 5.1, this is also likely to cause you issues.