Nuclear medicine is DO friendly. As a DO I recieved interviewes at 4 big name university programs, and several community programs. I was subsequently offered positions at the 2 universities I interviewed at.
They will accept a DO internship as your first year at all of the places I looked into.
If you have a usmle score it would probably be beneficial, some nucs programs may not have seen enough comlex scores to have a good idea of the conversion.
I know there is at least 1 DO starting residency in one of the midwest programs.
As of right now most if not all nucs programs participate outside the match, and they interview usually from November to ? for the following academic year. So you may recieve an offer at your interview up until several months after.