At this point I'd like to assume the heads are totally stripped. I just want to get them out by whatever force possible that won't take me 2 hours.

It's definitely a triple square. No confusion between a 6-sided bolt and a 12-sided one. And the 9MM doesn't remotely fit. 8MM fits perfectly, but the ratchet (a torque wrench) just moves without any grip and I see metal shavings on the socket, stripped from the bolt.

A torch isn't an option, as I have the upholstery in the very close vicinity. I'd like to find out what the best 'by-force' options are, that are fairly reliable and straight-forward.