There are two main ASL writing systems: Stokoe, and SignWriting. If you can work out how to make either of these (or any other system I don't know about, but is common amongst deaf users of ASL) work with Wikipedia, you've got a good chance of getting a consensus to start a new Wikipedia for ASL as a first-class written language. Otherwise, all you have is the visual equivalent of spoken-word readings of articles in other languages: they may be interesting and even useful, but since they're not interactive and Wiki-linked, they're not a Wikipedia.
Would an automatic converter like simplified Chinese/traditional Chinese be possible to convert it to other sign languages?