How about a series of rounds , starting off early season in individual countries, lets say quarter, semi and fina., For arguments sake lets use britain as an example, so british quarter finals , british semi finals, british final, then move on and incorporate the most succesful riders from ,um, over seas maybe and call it, um, the "overseas final", after that , bring in some riders from different continents and call it, err, how about the "inter continental final", and the "continental final " for most of europe.
By doing this, every rider in the world, through qualifying would have a chance on the big stage to ride against the best riders from all over the world, the whole series could be topped off by one big event, say , maybe called something grand like "the world final" where the winner couold be called "world champion".
That might just work........