I was going to mention using a wick, so I'm glad to see I was on the right track for testing.

The trick with those lighters may be that the entire tube is lined with a wicking material, so the vapor inside will be highly concentrated. You might try playing with a cigar tube with just a few drops of HEET, and shake it up before exposing the platinum to the inside of the tube. It wouldn't burn long, but if it lights you're a step closer.

Some craft felt might make a good wick to line it with.