If you’re going the drill the screw out method, just go straight to the angle grinder with an abrasive wheel. Or a beefy dremel may work.
Try to mark your depth really well so that you don’t hit the motor shaft. I’ve done this more than once with great results, drilling is a fucking pain. Wrap entire motor in a few layers of painters tape, put cloth around & hold in vice if you have one.
Is there any gap inbetween the pulley & motor can? A good gear puller is usually all that’s needed even if the screw it torqued down…
If you don’t have a torch, you could try a stove burner if you have a gas stove. Soldering iron def just wouldn’t transfer enough heat.
If the pulley has two screw holes, putting two socket cap screw or w/e in & using your gear puller on those is usually an option if there’s not enough of a gap between the pulley & motor.
