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@Brommers
My experience of screw extractors (one success, four failures) is that all too often they shear, leaving you with the delights of drilling out the hardened tool steel stud extractor along with the bolt. This is particularly a problem with very small bolts, as there's very little of the stud extractor to take the loads involved. It might work if the bolts are rounded but not seized, but I wouldn't take that risk.
As for the effort involved, the effort in getting a pillar drill (for those who don't already have one) is not inconsiderable.
Lamping in a torx driver might well work, but personally I'd be a bit wary of doing that when there's a carbon frame on the other end. It may well be fine, but I wouldn't fancy it myself.