Have you tried contacting Storck? I know they build some very high end and expensive frames and would expect them to be able to help you out in some way. Why anyone would build an expensive frame with aluminum dropouts and not have a replaceable hanger is something I don't understand but of course that won't help you now. If Storck can't help try some carbon repair shops, Calfee is one shop having a great reputation although it's also one of the most expensive. http://calfeedesign.com/repair/