Light Socket Extension help
Here's my situation: I want to convert double-lamped can lights into adjustable spotlights without making any permanent changes other than unscrewing a lightbulb and replacing it with something else. It needs to be able to go back to a lightbulb very easily. The cans stick out from the wall and each socket is oriented vertically, so one points up and one points down, effectively washing the wall up and down with light. The wall of 8 or so are wired so the tops are all on one circuit and the bottoms are all on another circuit.
The item from Lowe's works OK, but is $17 and more flexible than I need. Here's what I started to put together: At the top is a 100W Par38 spot light, screwed into a single outdoor metal lampholder. That is attached to a 1/2" pipe (PVC or metal), about 12" long. Now, at the bottom of the pipe, it needs to screw in to the socket to get power. I either need to get an E27 lamp base onto that pipe, or use a two-blade outlet adapter that screws in, and get a two-blade plug that is rigidly fixed to the pipe.
Is there anyway to do this that the NEC would smile at? Absent of that, a way that is still safe and secure, and safely removeable without changing the existing light socket arrangement?