I've heard that you can use very small doses of long acting benzos to taper. There are research chemicals available on the clearnet like:
which seems to be used for tapering off of benzo's.
If I had a problem with benzos I guess my first try would be to take the smallest possible dose of fpam to make symptoms barely(this part would be important) manageable, and then set up a timeline to gradually reduce(this part is also important) my dose in such a way that my body doesn't even notice the dose being reduced, until I'm finally taking so little, that I can stop completely. Probably over a period of a few months. That's just my first reaction to this problem, I've never had any kind withdrawal issue in my life, but if I did, that's how I'd do it. Caveats: Not medical advice, I don't really have any expertise in this subject, it's just a starting idea to entertain, etc.