Last Updated: 3/29
With uzi method credit to Run and Deadcode, I think the most optimal method is:
Turn 1: collect uzi, hope it kills. As you land from jetpack, try to use chute, this will skip the landing frames. At least, this is the way that gives you a chance at the optimal run. It's probably not going to kill though, only does maybe 10% of the time. So, in the retreat time on the first turn, try to get closer to the flamethrower crate. You can do a forward jump from right on the corner spot, and a backjump if you have time (can land on the crate if you're good).
Turn 2: Then kill with flamethrower, hitting yourself to shorten the turn.
Possible alternate method: You can actually use flamethrower to kill 1st turn, as in the 3rd replay below. It works often at this angle, but not 100% of the time. This is slower than if uzi succeeds, faster than if uzi fails by maybe 5-10 seconds. And of course, if it this method fails, you're kind of screwed. So I'm not sure I'd feel safe using it if I had a good run going. Maybe everyone can try it a bit and judge whether it's run-worthy.