Torx, all being equal, is superior to Allen bolts...
Except when either manufacturing tolerance or material lets it down. Then it is a nightmare. In this case- the Steel Sram bolts are basically made of flubber.
Hence my caveat, ceteris paribus...
Get a reverse drill bit, that should get it out.
@deleted started
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Torx, all being equal, is superior to Allen bolts...