I think the most realistic approach would be to find a cheap or free other FP3 camera module (more likely 12 MP) and figure out if you can “transplant” the internals into the housing of the other module. It’s not exactly instructions, but iFixit’s teardown and especially the high-resolution photo versions (see the 
symbol in the photos’ top right corners, then choose “Original”) from Steps 8 and 11 might provide some insight into how this might work:
Just to make sure, I have no idea if the 48 MP camera works in the 12 MP module housing. But if you find a way to open the module without damaging it, you might be able to reverse the procedure.
P.S.: Beware this list might be outdated, but anyway, have a look: ✏ List of people selling or giving away their FP3(+) camera modules