The short answer is likely yes, you will probably need level 2 rogue and a second dexterity die.
Explanation
It may be possible to complete with 6 DEX & 12+ CON, but it almost certainly requires 1 STR & 1 WIS, which may be impossible if you already have two STR dice (something I overlooked during testing).Once you have level 2 rogue, you’ll be able to increase the damage of Smoke Bomb still further with a talent point. So that + 12 DEX + 12 CON + 1 or 2 STR + 1 WIS should be a win.
Sorry it took a while to figure out where you were at. It’s definitely an encounter I’ll be looking at further; it’s scaled up a lot because you can bring a few multipliers against it, but obviously it’s a roadblock if you haven’t unlocked those multipliers yet.