A small square of toilet paper (or other paper) folded into a funnel shape to catch the shavings helps. I use pine pitch
to keep the flame after the paper ignites. There is lots on the
trees here due to the bark beatles.

I have also lit a wax candle by putting the shavings on a pre-
chard candle wick.

My mag block is a mini one I carry on my key chain. First I cut
it in half with a hacksaw, then cut half the mag off the long
way. Very compact and you then have two blocks.