My Time Pilot cocktail had happs fighter sticks in it for a while. Not quite as great as a leaf stick, but it is more than playable.
They recently came out of the machine though. I found one correct stick (heavy black balltop leaf switch, non-Wico), and I am installing that, and hoping a second stick will show up eventually. (It took me ages to figure out what kind of sticks it was supposed to have, until finally another Time Pilot cocktai popped up and ebay, and I saw what kind of sticks it had, and went with those).