IP issues. Otherwise, the options would be amazing.
Unlikely as long as the sculpt was not blatantly a rip off. A pose and a cape would be sufficient homage and you can't copyright those things. Given that they are also commonly referred to a Punch Monks it would be difficult to prevent using "One Punch Monk".
I'd just like a clever Protectorate Alt-sculpt model, and we could use another Monk sculpt. Its about time Protectorate had one.
It would certainly be easier to get away with than "The most interesting Elf in the world", and GW actually already ripped that one off with GolI AM A HOMOPHOBE Maneater(The Most Interesting Ogre in the world, who has drunk more barrels of Bugman's "Dies Eques" than anyone else in the world)
Sevy2 putting on cleats. Wrack Pole-dancer. Malekus holding a giant Pie. Reznik 2 sitting behind a desk that says "head of public relations" on it. 6 year old Harbinger being held up by a balloon. Durst shielding a small child from gunfire. Santa Reznik1 holding a "naughty" list.