It'd be the only way to make a movie Punisher stand out. Honestly all the superheroes and stuff are what keep Frank from being a generic revenge story.
I agree we don't need another origin/revenge solo film. If they wanted to they can just have Nick Fury and Cap have a discussion on Frank's past that could be less than 5 minutes.
I don't get why Frank's origin gets dragged out so much in the movies. Honestly think they might be trying to humanize him too much given him being kinda unhinged makes him more interesting. When he's treated as a complete hero he's one of the most bland characters I've ever seen.