Do the marriage restrictions of Vayikra 21:7 apply to a Cohen who is pasul for Service in the Beit Hamikdash? (eg. He has a moom. Am not asking about a Chalal)
There are well-known teshuvot on this issue, the most famous being that issued by the Rabbinate on Israeli Supreme Court Justice Chaim Cohen back in the 70's. He offered to cut a finger off to make himself posul so he could marry a divorcée. The rabbis said that even if the Kohain in question is horribly maimed (the example they used was losing an entire arm) and totally unfit for service in the Beit HaMikdash there is no way out, he still can't marry a convert, divorcée or chalitza widow. Cohen ended up getting married in a civil ceremony in NY and later followed up with a wedding officiated by a Conservative rabbi.
The story is discussed in Saul Bellow's "To Jerusalem and Back", here's a Baltimore Sun article from the 90's referencing it.