I'm in Florida and I make no outrageous speed claims.
A hand-held GPS unit is my speedo.
Not an iPhone either :)
P.S. - Great list.
Add to it:
Yamaha QT50 petcocks work on top tank General 5 Stars and Lazer Sport 50s. First thing I could think of.
Oooooo - also, horizontal "minarelli" scooter top-ends can work on your hobbit with minimal modding.