Here's the situation:

Contractor builds addition. Homeowner wires it - calls me to fix it.

At house entrance to the room - 1 gang box; 14/2 feed,
14/3 to 2 gang box on other side of room,
14/2 to light in center of room.

At outside entrance to room - 2 gang box;
14/3 from other side of room
14/2 to outside light

No feed for outside light! - need to get a feed over there! No access to attic or basement, and room is finish painted and trimmed.

I've looked at some X-10 solutions, but none seem to fit the bill. I'll end up with only one conductor available between the two boxes.

I thought there was an X-10 solution that would work as long as I had power to both modules, but can't seem to find one. Also, most of the X-10 stuff I've looked at is decora style - customer prefers "old fashioned" toggle appearance to match rest of the home.

Thanks! and appreciate your help!

Grov