I think i have an old bog standard 3 spoke from when i got the JCW, dunno if it'd fit and you'd need an airbag module for it... Could try it and see if you like? (if it doesn't, id give you the money back and just send me it back :P)
Its from my cooper, which is an april build 2005, it is a facelifted cooper not sure if bmw in their wisdom decided to change anything between the cooper/one... Haven't a clue on cost, link me to the ebay one and ill try work something out (the airbag modules quite pricey from dealers if i remember, £80 or something)
Going from a 2 spoke to a 3 spoke is infact a c*** however it can be done. I am going to get in touch with my dealer and some Mini specialists e.g mikey etc.
Umm loads of bits, but mostly standard lol... Dunno what fits and what doesn't as when i had a glance it looked as if a lot of it was "broken" off rather than taken off...