http://artsmed.org/ also http://www.sciandmed.com/mppa/ its a Pubmed referenced, peer reviewed journal. Focal Dystonia is a pretty specific disorder, and is more common among musicians than most other occupational groups. Finger splints are an effective mode of sensorimotor retraining. I can see how this could be applied to both your typing and clarinet symptoms.
How exactly is your Dystonia affecting your typing? Focal Task Specific Dystonia, by definition, rarely affects tasks other than those where the the symptoms originate. What treatments have you been seeking to deal with your dystonic symptoms? There are several potential treatments. It seems more productive to deal with your symptoms, rather than try to work around them. I'm a member of the Performing Arts Medicine Association, and can recommend several authors/doctors if you are interested. There are also several treatments you could try without medical supervision/assistance.
Maybe this has some other advantages I haven't seen mentioned, like the possibility of being used on Android or other mobile platforms? If its on the web, it should be accessible to more than just iPad users.