Tape the hose of a shop vac to the hole where the wires will come out. Make a "mouse" out of a bit of cotton ball and tie a thread to it and feed it in the other end of the tubing. Once the thread is inpull a string then the wires. Industrial electricians to it all the time but on a bit larger scale. The challenge might be closing off the unwanted air passages, etc. but you get the idea.