I don't know if you can still find something like this but I used a "Slingshot Posi Lock Fastener System" to repair 2 inserts in my 2006 Naish SOL. It's still going strong (as a backup board) today.
Basically you center it over the existing hole and screw two offset self-tappers into your board to clear the failed insert. You then use the Nylon nut and washer/plate to hold down the strap.
The kit I bought was dated 2004 but it worked so well I'd like to think something similar is still around today. The only challenge might be if board cores have changed so the self-tappers can't get any bite. You also want to be careful that the self-tappers don't go completely through your board.