There is also 'Knights of the Hellmouth' by Darvos
http://www.fanfiction.net/s/2484018/1/
It has Xander being turned into a female sith/jedi by Halloween and getting stuck as a girl and later learning jedi skills, even though Halloween is over. It gets a bit over the top later on, especially the sequel, because Xander knows a lot of high tech stuff and makes advancements to Earth's technology and joins X-com fighting aliens.
http://www.fanfiction.net/s/1990155/1/
'Half Blessing, Half Curse' by TD Master has Xander sold to the Chinese mafia by his father and winding up meeting Ranma and Genma in China, he is able to be taught Anything Goes quickly because his chi has been increased by the Hyena possession and living on the Hellmouth, he only needs help unlocking it and learning to fight, and Xander winds up getting the same Jyuusenkyo curse as Ranma and an Amazon fiancee, and into rather Ranma-like romantic hyjinx initially, only Xander actually likes the curse and embraces it and turning into a girl. I'm not sure if it qualifies to this thread because Ranma is actually in the fic, although mostly he only shows up in Xander's letters until the sequel fic when Xander visits Nerima.