dingdingdingding! We have a winner!
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Wood blocks are like gold bars at many a body shop. Losing 4th gear lmao boobs. Put your booba in there and stare at a bucket of relays while letting your imagination run wild. You'll pop it out! Seriously, theres a lot of tension in that itty bitty dent. Bad spot for em. Lots of hail jobs get roof skins or PDR but on the roof sides, conventional means. I still say hot glue first, thats the rule of thumb.
I gotta see this salvage fender finish, and you gotta lay it up there and eyeball the color, man. I know yer chompin at the bit to get that fender on the car, but lend an ear for one more idea and see if it applies. If the bottom of the old fender is rotted but the top is not bad and matches the door, chop rotted section off old, below the rocker molding. Paint edges to protect from rust, rivet together, reinstall mldg, done and with no paint.