Thoughts are: * Most board fabs have routers that can do this work. Can yours rework these boards? * Scrap the boards and start anew. Someone made a mistake. Cut your losses. * As a wild and crazy guy alternative, buy a router with a 45* bit from Sears [or someplace like that], rig a fixture, set-up venting and filtration, provide personnel protection, and go for it.
As a general comment, we hope that you're providing your troops with adequate personnel protection while they're filing these boards. Fiberglass can punch holes in their lungs after it's been enhaled. Ask anyone at your neighborhood body shop.
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