I figure I'd post this here because it should be doable normally.

I won't actually be submitting this because it's cheated. I used a Turbo Controller for the weapon swap, Ultrawide mod on the executable so I can see hitboxes easier and tell when Grim Matchstick disappears off the right side, and had HP info open (though I didn't need to pay attention to it for this one). 00:35 and maybe a little faster should be possible if you time your EX to fire Roundabouts the times I used Lobber EX and avoid losing DPS to getting hit.

EDIT: Got 00:35.97s after this, displayed as 00:35 in-game.

Nice, definately helps knowing the hitbox stays there :>