The way I've been starting the room is to
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×lure all 5 roaches east of the southeast wall and then run west to trap 3 in the trap.
That leaves me with two following me that I can maneuver around if I
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×break some walls in the southwest before doing anything else
Once that's done, if you got the right set up, you can let out the third roach from the trap and have it get stuck on your sword like I described in my first post to trap the other two roaches.
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If you need to think outside of the box, then you didn't build a good enough box.