The only tinder that I've used under "harsh" conditions was Coghlan's emergency tinder, and that was to get a buddy burner going in the middle of an alluvial fan with a steady 10 knot wind. I don't remember if I uses a ferrorod/magnesium block or a windproof/waterproof match to get it going.

For that matter, I have a Sawzall/hacksaw adapter in my kit with a number of blades (When I'm not borrowing it for home maintenance). A ferrorod/mag block would pair well with that as an additional means of fire starting.