peterowensbabs said..
Epoxy paste????
This^^^
Someone wth more experience may say different, by id try a thick mix of epoxy paste. Wax up the screw (so theres a thin thin layer on it) smear a good dollop of epoxy paste in the hole and gently screw in the screw to the bottom, wipe off the excess.(not with the footstrap on it

) come back to it 2 days later and unscrew the screw. Will definitely require some forceful gentleness if you know what i mean.
Worth a go. If it were to part ways, its not something thats going to strand you out there. If that doesnt work, it might need a new footstrap insert.
other option is to compromise a bit and live with a different footstrap position.