Probably the best way to do this would be to try and get accepted for the VMCC parade lap, which is more road bike focussed than the other  laps at the MGP.  Your bike qualifies on age. I'd imagine you'll need to join the VMCC and there'll be a fee to pay but you can do a closed roads lap of the course if accepted.  Places probably sell out quick though!

http://www.vmcc.net/