It's easy to resolve this: take C4 with you - once you're down, detonate yourself.
If that's not enough, take a sneak char, take 2 C4's, go down the lift with one plastic (leave the detonator above), die near the bot group, get back, grab another C4, sneak, once you're down detonate the first (be sure not to mix the detonators) and then terminate yourself.
Worked for my "oh fuck" probs quite a few times.
You can also try a sneak sniper or crit burster with XL, maybe FN FAL HFPa - once you're down (have the gun equipped) get close to one of the bots and hex it (they take a while to react that you're there). After you die, repeat till all are dead.
Nowadays I don't even have to play these tricks anymore though - made a lvl 24 bunker killer char, melee HH tank easily takes care of it all.