I would recommend either a Swedish “Light my Fire” firesteel, a Strike Force firesteel, or a 4"x1/2" flint rod. I keep a finger length/size piece of fatwood attached to my Strike Force with a rubber band (which can also be used to start a fire). When I need to make a fire, I just split the fatwood into a bunch of small pieces, and use some of the cotton that I keep in the large “pill fob” I attached to the end. I can fit 7 jumbo cotton balls in it. You can buy them at Rx stores, Walmart, etc. of varying quality. I’ve never tried what you’re thinking of personally. I try to avoid mess/hassle if I can avoid it, and I can start fires just fine with my rig. Here are some pics:

Strike Force w/ small piece of fatwood


W/ pill fob attached


Starting a fire using ONLY shredded inner tree bark and nothing else.