The DR originally had a white plastic, manual Acerbis unit with an old white ICO back in the day.
I've still got one of the old ICO's that came off Mick Goddard's ill-fated KLX and I'm sure there's an MD Roadrunner on an old Husky.
So, maybe it could look reasonably period correct with that combo.
Not that I'm going racing on it (I think............
) but I would like to have an electric unit on it.