If I wanted to melt Lego....

Let me build the scene before a posse forms and hunts me like a witch!....

So.... I'm making a Lego Stop Motion short film (20mins or so).
If you're not sitting down you may want to around now (this also serves as a few more seconds I have to get away....)

I have a script and it involves a "handicapped" Lego Minifig. Now it has taken alot of months of deliberation and MOC trials.

I then realised I have about 20 or so minifigs (circa 78-86) which are in a pretty bad way.
So to make my "handicapped" minifig more realistic I thought about melting his legs. Now to just apply a lighter would result in "blackness" and I want to avoid that (and trialling real people that walk past my house....)

Long discussion cut short ....
Is there a way to melt Lego legs without discolouring them but still disfiguring them? I'll probably do it with the torso attached so they still fit but if anyone has any ideas (or if they have also 'done the deed' I'd like to know to save on trial and error of alot of innocent (yet retired) minifigs.

If you could please refrain from forming a Lynch Mob that would be great too :)