I've used these before with good success. You can get them in nylon.
Most hardware stores carry them.
1. Drill a hole in the deck
2. Fill the hole with polyester resin
3. Screw in the plug, make sure resin doesn't get in the thread. Puting wax in the thread will help keep out the resin. (if the plug is too long cut off the pointy bottom bit)
4. Once the resin sets you can screw in your stainless steel footstrap screws. Get some with a thick thread.
It should sit flush with the deck of the board. If it doesn't just sand it flush.
Enjoy!