If such a perfect item existed, everybody would be carrying it around, and you would not need to ask this question, as you would aready own one.

I once read in a book that you can take come embers and put them in a billy-can covered in moss. Then, you can carry your fire from place to place. This shure would put less of a stress on your flint an butane supplies, at the expense of portability. Would this actually work?