Good luck HeltorChasca - I scratched the itch this year, and curse myself for not trying it earlier!
You also get fixed points for 100km rides. Granted this season you get points for 50km upwards now, but I liked the idea of doing the even more laid back shorter events and also get 'internet' points.
I sent my money to Richard. Recorded my rides in the brevet. Got calendar organisers to stamp and sign their events. But all Richard wants for normal fixed challenge points, is an e-mail listing the rides you did on fixed at the end of the season. He'll double check they exist in the results section, and could always ask for the brevet.
No further evidence was required. The number of fixed gear riders is so small - there would be a disturbance in The Force if somebody lied - we would KNOW
Enjoy the pedalling!