Guess you haven't seen the new one? Electric and connected within the barn my friend.lee, couldn't you always borrow the nspa compressor?
Plus I think Lee will need it on a adhoc process, initially I would suggest you look into bulk air on a sale or return.
I know you work in a very busy place mate and totally understand if your boss doesn't open it to anyone other than your current clients.
Hopefully he sees the benefit to team training though