Definitely possible with FCPX but you’ll need the right gear and overall approach. Would definitely do thorough testing before committing to a specific platform.
Ingesting into 7 is definitely a possibility but you could also probably do this more efficiently with the right deck and Blackmagic or AJA capture hardware combo. Might be worth bringing in a workflow consultant if the project is important enough. And yes that was a shameless self-plug.
Noah
FCPWORKS – FCPX Workflow
FCP eXchange – FCPX Workshops