For badly seized pinch bolts I snap the head off the bolt with the breaker bar and then pull the bolt out from the other side. Lube up a few thick washers and the thread with CV grease, put a couple of C-shaped wedges (also made of thick washers) in the pinch-gaps, and then tighten a threaded rod coupler on to the end of the bolt. As the coupler is tightened it pulls the headless bolt out of the hole. Its tight on the D2 alloy hubs but doable. A4 and A6 hubs have more clearance so its pretty simple on those.
There is a proper tool for doing this job, but at £500 I can't really justify it!
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