I just meant like what a previous poster “mopman” did to mount his foil.
Looks like nut inserts embedded in plastic/resin.
If the board is heavy glassed, a few more layers of patches and inserts mounted in strong resin/milled fiber columns that go all the way from bottom skin to deck should work.
Where boards often snap is at the front edge of the foil plate so that is where the bottom needs to be strongest. If through bolting, big washers are a good idea.
Thanks for the pictures, I think i do remember seeing that little 4’10” before.