Firebrands are an eternal annoyance in haven, and although the devs have graced us with a couple of options to circumvent them, (pyrite sparks, flint and steel, matches) these are either hard to maintain a steady supply of, or accessable only through steel. I suggest a couple more primitive solutions as an alternative to rubbing 2 sticks together by hand: a Bow Drill, and a Tinderbox & Kindling.
Bow Drill:
Tool crafted using a tree bough and some string, when equipped in 1 hand, reduces the crafting time of a firebrand by say, 20% at quality 10, and scale from there. If this is too convenient or accessible, maybe it could be a 2 handed tool, like a shovel, or require wild plant fibers rather than any string, meaning it would take a couple days and some farming to get access to.
Tinderbox: would be an item used to store various types of Kindling, made using a quern. Kindling would be an optional ingredient when crafting a firebrand, like spices in cooking, and be pulled from the Tinderbox automatically if it is on your belt or pouch slots. The most basic type would be BirchBark kindling, offering a 20% reduction at Q10, and from there maybe a ground charcoal/coal offering 30%, or more pricey wax/tallow & fabric firestarters offering 40%. Kindling reductions would stack multiplicatively with the bow Drill (i.e., a Q10 bow Drill used with Q10 BirchBark kindling would have a crafting duration of (0.8*0.8=0.64) 64% of the default crafting time.
Admittedly, I have not gotten to use a flint and steel before, and the wiki is unclear on how fast they work, so if these numbers invalidate the much more expensive tool they would obviously need to be dialed back, but I think offering SOME way out of firebrand hell, or at least softening it up a bit with a new tool and some more replaceable consumables, would be a nice feature.