Dan likes your earlier idea to create a distraction outside the cave to draw them out. Some kind of sound that won't alarm the raiders, but would entice them...like maybe a succulent animal? A wild hog, perhaps?
Aelric still thinks you should wait and watch a while. You're in no rush to attack - the raiders will have to come out of the cave in time, anyway. When they do, you can attack them by surprise.
Martelo is still concerned about the risk of waiting and having more raiders arrive. He still wants to take them by surprise. If they've been drinking, they'll be sluggish and easy to take now before they sober up!
Mistress Faye suggests that you could set up an ambush at the latrine. The raiders go there one at a time and you could pick one off, improving your chances a bit.
There is still a possibility of shouting out to the raiders in the cave that they are surrounded and if they do not surrender, they will be killed.
Some other creative option? (please comment below)