Alright so
Drive in torx bit with big hammer, check. Heat with hairdryer till it's to hot to touch, check.
Start turning, check.
Repeat because it still so tight I only get a couple of tiny movements before head threads, fing CHECK.
After a couple of goes I now have the bolt part way out (3mm or so) but we now have our next installment in fuck this bolt and the bike it came in on.
The bolt is now just spinning in place after coming out maybe 3 turns. Gone from stripped bolt head to stripped thread I think. Any ideas on getting a bolt out that doesn't wind out when you only have a few mm of bolt head to work with?