Relays would work - but if you are worried about broken wires, loose connections, etc, then you need a separate relay at every location where there is a switch. Not a practical way forwards, even more wiring needed, and will cost more than replacing the switches! The only real answer is NC switches, wired in series. This is particularly important for limit switches as you really do want these to function reliably, but I'm not sure if you are using combined home/limit switches. If these are just for homing and you have separate limit switches (NC, I hope), then the home switches are not safety-critical and you probably won't actually break anything if something in the home switch circuits fails.