Male!Arwen/female!Aragorn, assuming written consistent with Tolkien's world in other respects, would be very, very cool. There's got to be another alternate history in which JRRT actually did that, just because I'd love to read it. I mean, really--I already adore Aragorn. But if he were a woman, with all the same nobility of character, and bravery, and kindness and sternness and healing powers and destiny *too*, and if Arwen were able to be an Elvish artisan as you say (and not be knocked for it because she was "a little woman embroidering")...I can just picture it now. Thank you for the idea. *has been made happy*

And of course, how would that affect Eowyn? Leaving aside even her romantic crush on Aragorn, would it affect her any differently to see a woman coming as the great hero to save the day? If, say, she were still straight and so didn't sexually crush on female!Aragorn (but still fangirl Aragorn as a hero), would she feel as rejected when she couldn't go on the Paths of the Dead? And would that influence her decision to ride off to Minas Tirith as Dernhelm?

And if we're going to do LOTR genderswapping--what would a female Gandalf look like?

--Nenya, surprised to find this interesting her as more than just a bad-slash cliche