there is no possible way "100% democrats in the files" just goes without any pushback, so yeah either they're totally unredacted and unaltered (likely, comes with its own set of problems) or the democrats absolutely will ratfuck the others.
personally I think the most likely outcome is that Trump's name appears far fewer times than we expect (after they've, yanno, had their way with the files). Maybe a couple instances to satisfy the public that he was a skeezy fuck, but anything that implicates him in something serious will be changed to point to someone else's name. Usually a Democrat, maybe sometimes the RINO of the week. You'd then just have to make sure every document agreed with every other document -- say, dozens of people working in teams for a few months could get that done. Say, weren't a team of FBI agents doing exactly that not too long ago? Sorting through all the files, looking for every instance of Trump's name? Wonder what's up with that.
That would be the smartest way to alter the files. Leave everything else untouched, just make sure the ~~golden~~ orange ~~boy~~ old fuck isn't smeared. Are they smart enough to do that? Possibly. Maybe. Hopefully not, because the "100% democrats" shitshow would be hilarious to watch