It's not necessarily hypocritical to oppose granting URM status while being willing to accept it if offered. It's perfectly consistent to hold that whatever the rule smay happen to be, one should seek to maximize one's returns under them, even if one doesn't agree with every rule.
If you'll allow a brief analogy: I'm a tall guy, standing 6'5". I don't think being tall will make me a better lawyer. But suppose that law schools, for thier own reasons I don't even understand, prefer taller candidates. I think this is silly, but I'm not going to turn down height-based advantages if they are offered.
This stance would rule out prostitution or fraud to get ahead, too.
So yeah, if anyone offered my admission based on thier determination that I was a URM of some kind, I'd accept. For the record, I think that affirmative action can in principle be done right, but I don't know (or care to know) enough of the specifics of any program to say whether that's happening. I just check the "White/Caucasian" box and get on with my life.