Two in parallel would ease the loaded voltage situation a little with the 10440. They make 2 and 3 cell parallel packs so it's been done before.
I used 10440s in my first couple of flashlight
mods. Instead of parallel (which now that I think about it wouldn't have been a bad idea) I modified the battery carrier so that only one made contact and the other two slots were spares. I had a bunch of the 14440s (used the DSE 701 cigar for a while) and needed something that would last all day while on vacation. Even though the max discharge rating is low for this cell, it is used in the e-cigar and will "red glow" the atty. I never did check the resistance of the cigar atty, just gave up on them. Maybe the fact that an e-cig isn't a continuous current draw allows these little cells to work OK.
Two in the lighter would probably be pretty good.
Rocket