Has anyone attempted to fill in the side trim holes?

Thanks for the advice. The reason I would like to stay away from welding is that if I don't put the trim back on, I only need to scuff the whole thing, fix the small paint chips that occurred on the top of the doors and quarters, and respray the whole thing with clear. If I welded the holes closed, I would have to take the whole area down to metal and re-do the body line. What I was thinking on the filler was that I could put a backing in behind the holes and bevel the current primer to create more surface area for the filler to bond. I don't see why this would be more prone to cracking than any other body filler.