They've got noise simulators for electric cars like Teslas... make them sound like they have a V-8. No reason you couldn't add the same thing to an electric Nieuport, and simulate a LeRhone. Or make an electric Fly Baby sound like it has an R-985.
Personally, though, I'd like to get the "Flubber" sound from the original "Absent-Minded Professor" starring Fred Murray.....
Ron Wanttaja