Some posts git overlooked last year, in the early days of the pandemic -- and that really sucks, because you're the kind of person that I enjoy conversing with (documentary filmmaker). You have special considerations for your workflow, and it's something I specialize in. I've worked with many documentary filmmakers over the years.
When you have mixed-content sources, you ingest at native resolutions, interlace, etc. And then it's all merged in post, and using non-NLE for best results. (FCP is terrible at deinterlace and scaling SD, for example. Something like Hybrid for Mac is better, using Vapoursynth for QTGMC and the scaling.)
The ingest hardware matters, too -- TBCs in use (both line and frame).
Where are you now on your projects?