I temporarily nailed decorative 1x4 poplar boards on the ceiling of our foyer after ripping out part of the plaster between floor joists when doing a bathroom remodel above it. I put the boards up because there was a question in my mind about how to repair the drywall, which was thicker than contemporary 5/8 thickness; it was a three-layer board installed during the late 1940s when plaster was transitioning to drywall, and the sheets had a base coat of plaster applied, then a second coat of plaster, and a final cream coat. It was like plastering, only over sheetrock not over mesh or lath.
Anyway, back to the question. In a hurry, I used what nails I had on hand, 3" 16GA finish nails like the ones below; and now they need to be removed so I can reuse the boards (and repair the ceiling properly) but they are easily bent and therefore cannot be hammered out by tapping on their pointy end.
Is there a clever a DIY-hack to help accomplish that task?