I think I understand where you're coming from now. And hopefully you haven't interpreted my questions as being hostile or defensive, just trying to do due diligence before ruining my door lol. I very much appreciate the responses.
As for Ammo, I don't recall any videos where he's specifically done what I had in mind (touch up + sanding). The ones using touchup are either too small or too large for sanding to make sense. Sanding / repolish videos were done to fix marring / swirls with spectacular results though, and I just put 2 + 2 together.
Here are 2 videos that are closest to what I'm potentially dealing with: