As far as I’m aware, the deal with Dwyrin is indeed supposed to be that he should play unranked games:
But I remember there are several voices saying that for teaching purposes an exception should be made for Dwyrin, since there’s a thing to be weighed here: whether the benefit his videos have on the Go community outweigh the drawback of people playing a sandbagger.
I don’t see how that applies to your situation. How would allowing you to sandbag have any benefits other than giving you the possibility to cut games short against opponents you don’t wish to play mid-way?
Having a disability does not change that ending ranked games prematurely is problematic. There’s an easy solution for those who cannot finish games to the end all the time, namely unranked games, thus I believe we do not exclude you from playing on this server with a disability that prevents you from finishing your games.
Please clarify why you need to play ranked as well as be allowed to abandon games?