I like the idea of a small screw. You might even consider tapering the end, so most of your purchase will be at the very outer end of the pin.
As for drilling, I don't know if you were thinking of drilling the pin itself, or the back side of the trigger guard. Drilling the pin will not likely go well. Drilling through the back side, however, might buy you access to the pin to push it out. A really small hole, drilled slightly off center, might be just the ticket ... but it would be last resort kind of ticket.
Saands
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