Realistic Torches adds a box of matches.
Could you make that work for lighting the campfire, in addition to the Fire Bow? It seems really weird that it doesn't.
Also, when I try to light the campfire, it also creates a fire in the square next to it. This is not only troubling, but potentially OP -- being able to turn sticks and string into working fire seems like it could lead to some griefing or something.