You might want to check out this thread for ideas:
http://speedzilla.zeroforum.com/zerothread?id=33851 BCM here in the states have a big bore kit to make a 923 out of a 749. Maybe one of your shops can do the same? Sigma maybe? Here's the shop's website:
http://www.bcmducati.com/ Nearly forgot my manners. First post. Great site you have here with fantastic info. Hope you don't mind a yank in your midst every once in a while. I will do my best to not murder the Queen's English!
Cheers,
John