I don't think adding a light would be a problem. The loss of the rear reflector might be a problem in some states. Not something I would worry about, I've removed many side reflectors but we do not have inspections.
No Inspections would rock! They check everything here, they even grab your risers and shake them to check the bearings in the neck. At the end they pull out the decibel thing and check your exhaust reading. I think they lowered it again here in NH to 92, I'm glad I kept my factory exhaust !