So here’s my workaround to my self created problem.
1) new project in library
2) place 60fps clip in that project
3) detach audio
4) match up last frame of video with end of detach clip audio
5) export that project
6) Import retimed clip with audio.
The sync is very very close, if not perfect. Certainly good enough to work with for my needs.
If some one has a 2 click method to solve the same problem I’m open to that, however this was easy enough. I first tried solving the problem in Resolve and it proved the concept, and then repeated the process in FCP project.