BraveSirRobbin
Moderator
Neil;I am sure this is going to raise eyebrows but here is a question: Can you use the ground for the neutral? If you opened up your panel you would see that the ground and neutral are really one in the same. I am sure this isn't up to code but the alternative to re-feeding those switches seems overly complicated.
This is not a good idea as it will put current on the ground wiring system, thus causing a safety issue. The ground wiring scheme is to keep all appliances, outlets, etc... at the same (ground reference) potential.