Wow, I hate to hear stories like that. I don't have an extra board to sell, but your's might not be beyond repair. The accelerator might be lost, but the mother board might still have hope. I'm betting Belkin might say that Amiga is not a supported system and deny your request, but maybe they'll come through.
There is still a repair center in France, but is that cheaper than finding another board I wonder. I kinda "retired" from repairs several years ago when my admin job and family grew to take all my time. I still do repairs occasionally, but time is so short these days I can't commit to schedules for my "hobbies".
You can PM me though and maybe I can help with info and advice.
Plaz