While being alienated by it at first, I tend to agree with your initial solution of blade-ii, since it captures the original title as accurately as possible (as also proposed in this related discussion). While one could see it as "just a sequel number", it is still part of the original title, in the same way as Star Trek 2 isn't tagged star-trek-2 or star-trek-2-wrath-of-khan, but just star-trek-wrath-of-khan and Mighty Ducks 3 is tagged d3-the-mighty-ducks (disclaimer: I've done that), even if "looking awful" (which, I agree, is not a particularly sufficient reason).

While being alienated by it at first, I tend to agree with your initial solution of blade-ii, since it captures the original title as accurately as possible (as also proposed in this related discussion). While one could see it as "just a sequel number", it is still part of the original title, in the same way as Star Trek 2 isn't tagged star-trek-2 or star-trek-2-wrath-of-khan, but just star-trek-wrath-of-khan and Mighty Ducks 3 is tagged d3-the-mighty-ducks (disclaimer: I've done that), even if "looking awful" (which, I agree, is not a particularly sufficient reason).