I’ve got a stuck one and I’ve basically almost destroyed the screw getting it out. But it’s not out.

Given I have no GT85 and can’t get any for a couple of days, would dripping some lube on the screws work or should I just get a knife out and try to hack the block out?

It’s wortha try with the lube, won’t do it any harm even if it doesn’t work.
Try a good whack with a hammer, might free it uo.

Pliers did it in the end.