Door hinge mounting plate and POR15 questions

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The mounting cage that holds the plate in my door pillar was rusted out at the base and the plate fell out. I have the plate and have prepped and painted it with POR15 as well as the cage I had to fabricate.

Before I welded in the cage with the plate I tried threading the bolts in the plate and it feels way too tight, like im stripping it as I tighten the bolts. I think that the POR15 is in the threads and from what I have heard its very difficult to remove.

Should I just get a new mounting plate at this point? Do they even sell them?