First, Tom W. or one of the other veterans are more experienced and qualified than I am to answer your concerns.
I’ve never worked with your camera or with 24P before, so anything I tell you is just a guess.
But in my experience with other formats, it’s been irrelevant to watch my NTSC monitor during capture, since the FCP interface/capture window on the computer monitor always took precedence in the capture chain over any external monitor.
I would think that, once you’ve ingested successfully, returning to DV-NTSC shouldn’t have any negative effect on your editing process, since that setting should be purely monitorial.