-Support
D class aren't really suppose to be strong. They're prisoners. People need to strategize with supplier more. Getting successful riots is really all about strategy. Even before I got a CC, rioting wasn't too hard if you had people to actually wait for the right time.
Of course it's hard to get people to listen, but if you use those blindlessly running in to your advantage, then you'll succeed.
Time is all you need as D class. Not a new class.
As for the whole medical supply part, it adds something extra for staff to manage that really shouldn't be a think. I don't think they'll like that too much.