×Assumptions
I need a monster to be on the pp to awake the eye.
B. need to go on the west side of the room to kill the seep.

I'm able to send a queen on the west side, but it's no good, she won't spawn, and once she's in there I can't make her change direction.

I can't go in the west side to prepare a path for the queen, I wouldn't be able to get out.

I could kill the seep, protect myself by dropping traps and wait for the briar to kill the eye, but I don't see how I could get to the west area and leave a path for the briar to follow.

I can make the briar grow to the west area to trigger the PP (fun to do, haven't yet seen a room based on or using this), then I can go and kill the eye, but the seep is then embedded in briar.

The only solution I imagine would be to have a gel baby stored in 15,1 with an horizontal preference, but I don't see how I could have a baby staying there while I go south to use the tunnel.

×had a roach on the very top square...

×I would crowd a bunch of queens on the top platform, maybe five or so, then stab the one on the top square and back away just before the queens spawn, leaving a roach egg on the top square. Then I would push queens near the roach egg before it gets a chance to move.

×Briar growth direction can be controlled remotely... after a fashion.