Let's start from the beginning. How did you determine that the pin was bent?
I've swapped-out a lot of pins in my days, primarily because the client wanted a different pin configuration, 14 to Radial, import radial to Uni-Radial, etc.
I can't remember ever seeing a pin bent so bad that it couldn't be straightened. This eliminates all the drama of using heat on a high-end cue, in this case, a Schon LTD.
Contacting Schon to ask if they would do it might not have been a bad idea either. I mean, it's their cue. Unfortunately, Schon most likely won't touch the cue now, or ever again for that matter.
Any time you have a major issue with a cue, your first move should be to contact the builder. Why? Because it's their cue and they know a little more about how the cue was constructed than you do. Also, once they accept the cue back for repair, all the liability is now on them, not you.
Sometimes you have to do the thinking for the client.
The client probably thought this would be a quick and easy repair and you may have even thought so as well. Now you've got a wolverine by the tail and he ain't likin' it. Sorry to be so blunt with my illustration but I don't see this finishing well.
Now that I've burst your bubble with my 'down-side' implications, I'll offer a viable solution. You won't like the initial cost but you'll make it back in the long-run. CARBIDE TOOLING.
The carbide end-mill eats away the stainless pin like candy without putting the integrity of the rest of the joint area at risk. No heat, no blistered finish, no re-install of the joint collar and no toasting of the wood.
What Manwon suggested is very real. The amount of heat needed to loosen this pin could very easily upset the bonding of the collar and you may not notice it. Somewhere out in the world now, that collar could come loose.
Once epoxy has been heated, it has lost all of it's bonding properties.
It will not magically reconfigure itself to (re)form an adequate bond.
Moral of the story: Always contact the builder first.