Well, keep a couple things in mind. First, a big hot burn is most likely going to ruin the nice paint on the outside. Second, a good burn usually helps in removing the liner but usually you still need to get some of it out with a wire wheel which is a chore. In all you are setting yourself up for a bit of work.
Here is a link to some other threads that deal with liners.
Also, a simple, neat, and quick solution would be to have it sand blasted. People have found places that will do a drum anywhere from $20 to $50. This might be your best bet.