Torso switch without crack?

You can but you would also risk snapping the pin. The plastic on the torso isn't the same rubbery plastic as the arms and legs so they might not soften to a point where you can pull and stretch the pin enough where it gets skinny and have the give you're looking for in order for it to come out easily. Just an example, I recently heated up Irwin R Schyster's legs to separate them at the thigh so I could pop in the lower thigh portion from a figure with shorter legs. The Irwin legs came out after a while but the ones that came from the donor figure, a spare Paul Ellering I had, snapped.

A point of interest here is that the upper thigh of the suit bodies seem to be the same hard shell plastic the torsos are made of where as the lower thigh is the rubbery plastic. The point is the rubbery plastic actually got to the point where it snapped in two. I would imagine the pin on the hip portion of the torso wouldn't be able to stand the stress as easily. Out of curiosity, I took a screw driver and bam, I easily cracked the thigh in half with zero damage or stress marks. I didn't even heat it up first. Had I started with this, I wouldn't now be waiting to pick up a figure from a set with a BAF that I don't need to get a spare pair of legs and everyone's favorite wrestling tax accountant would no longer be looking eye to eye with the Undertaker.

That's just my experience. I don't know if anyone else managed to do this and I would be interested to know as well.

For almost all of my customs that required a torso crack (which I don't like because you can often tell) I simply heated up the torso, took a sharp knife, and one-hit it through the torso slit with a hammer. You end up with two clean/flat halves. In other words you're splitting the torso from the waist and legs. You do this with a second figure and then just glue the halves to however you want them. Some people might ask ... why in the WORLD would you glue a torso on like that!? You can't ever rotate it! To which I reply ... how many of your figures are posed with a rotated torso? None. None at all.