PVC pipe and a chunk of NERF (Score 1)

Common sense and some ingenuity ... for the nerf and air pressure. Many industrial commerical electrical contractors use a method similar to this idea, already. They'll tie a light-weight line to a foam ball and use compressed air to blow it through the conduit in the building, pulling the line through. Then, they tie the wiring to the line and pull that back through to wire circuits.

The only problem with this method -- is that conduit is 3/4" diameter and thin wall galvanized metal and can take the higher PSI of the compressor but the Central Vacuum Pipe of a home is 1-1/2" PVC, like most sink drains have.

The vacuum might not generate enough push or pull pressure to snake lines though. Why not run the wire through the wall cavities and fix/replace the central vacuum? Then you'd have both working.

I'm just a bricklayer
-JfZ