Hang in there! and good job reaching out for help, that's how we all make leaps of progress here without hurting ourselves.
I recently registered this 85 bus in Virginia and they tried to steer me in all those complicated directions.
I gently shared the information as follows; the police inspection and new vin plate is ONLY for vehicles in which the motor or chassis have been modified in some way; OUR Busses have not. So this does not apply.
Eventually a lady came to help and asked the girl to simply put MOTORHOME in the place where bus was and try it. It worked. Virginia no longer has a code for RV, so dont bother with that. Just use motorhome.
I also took them photos to show i had met the requirements or a beedding area, a separate heating and cooling source, a compost toilet, solar power, inverters, etc.
Maybe taking a copy of this actual post may help them. It paid off to be very patient with them because it is NOT something they encounter often or even know how to do.
And most of all good luck!