I'M NOT SURE I UNDERSTAND WHAT YOU ARE SAYING
BUT HERE'S MY GUESS AT THE FIX.
ORDER X10 3 WAY LIGHT SWITCHS AND INSTALL
THEM IN THE BARN. AS LONG AS THERE ARE NO
POWER POLL TRANSFORMERS BETWEEN YOU AND THE
BARN , YOU SHOULD BE ABLE TO TURN THEM ON
AND OFF FROM THE HOUSE BY USING A TRANSCEIVER
( TM751) AND A REMOTE KEYPAD. GOOD LUCK