The t track sounds like a good idea, another option could be if the studs are in the right spot on the wall, to do a bar coming out horizontally to hold up the lights / wires. For where they are now in the ceiling, do you have access to that from above? You could also just put a 2x4 or something where you need it above the sheet rock where you have the openings and shift the lights over that way.
For the wires, Its been a while since I had mine, but I think they had an extension for the power wires you could buy, then for the ones to link them, it's a regular ol 3.5mm cable you can get. That may help to extend and run through the ceiling if that is the plan.