On Instructables I’ve published my tutorial, how to make conversion from spd to flat pedals (or rather how to have such an option). The hack I made before short trip on the bike to France. The purpose was to have an option to ride in standard shoes or sandals on spd pedals. Used twice during the trip, works fine. Anyway I’ve entered the “Bike contest” so keep voting if you have an account ;-).
Cheers