Oh yeah, put a door at the end of the tunnel that leads to your fort
You don't actually have to use the inside of your fort as a lure, just chain up a kitten behind all the traps then lock the door behind the kitten. Then dig a hole behind the door, or build a wall behind it in case you have trolls. Make sure to put the kitten behind a bend or unlocked door so archers can't shoot directly at it down a straight hallway.
I've found that the cave trap corridor is by far the easiest way to get rid of lots of goblins when you have no military, assuming you have sufficient material to build enough cages. If the first corridor you build isn't enough, build another one and chain up a kitten.
And of course the mass cage recycling system helps out quite a bit when it comes to recycling all the cages, and having fun with the captured goblins....