This looks to be mainly for files where there is no TC or the TC is very off, which is not the case for me. There is TC and it does match the video but it is a frame or two off, and I need to move the audio so that the two are properly in sync.
I’d also like to not go through a third-party software like VideoToolShed or PluralEyes as there should be SOME way of doing this in FCP without having to create a sequence for every clip or having the red -01 on my clips (which makes it disconcerting to my editor).