Hi James,
How small do the Brodak spinners go?
If no luck there, then Jim Lee has some slightly smaller ones that are works of art. Spun aluminum like the old Frooms, and a nose piece with a hole through it. He makes the adapters for Cox or Norvel.
Marshall Busby built a small SV (can't remember, maybe a miniature SV 22?) and used a rear exhaust .049 with a real pipe. Check with him, he should be in the PAMPA Directory.
BIG Bear
RNMM/AMM