I was considering this as well for a character concept, but I was going for a different flavor. Besides the Catch (being fire), the character could only use ectoplasm to patch up his body. So either he'd have to lie in a puddle of it before it dissolves, or he'd have to be in the Nevernever. Of course, to make it interesting, he wouldn't have a power to ease a transition into the Nevernever. But, like most supernatural creatures, he could cross over in a place attuned to death or some such. (Are there any mechanics for that, btw?)
How does this sound for a recovery power? The idea behind it is that he somehow is a living soul/spirit trapped in a dead body, so when there is ectoplasm (spirit stuff) around, the spirit uses it to heal its shell.