I do a quick grade of all my footage including BRAW in Resolve, export as ProRes files, then edit in FCPX from that. Works great.
There’s one difference between BRAW footage and the rest, but otherwise no change to my normal workflow: For everything else, I import the original files into FCPX, then relink to the graded ProRes files when they’re ready (making sure they’re identical enough to relink is a hassle, but this way I’ve got an easily reproducible reference established). For BRAW, I just use the already-graded ProRes file.