I would be interested too since I am just South of Spokane.
The only local shop I have had contact with was:
Alpha Omega Diesel & Bus Repair
6624 N Freya St Spokane, WA 99217
I have not had them do any work but they loaned me some brake parts to get me rolling until I could replace them from Luke. Very nice people. They maintain their own charter fleet and some of it has some age. Don't know if they are 2 cycle savvy. The person I dealt with did not have much gray hair.
I have been meaning to stop by Spokane Transit to see if their is some gray hair there or someone they recommend.