Lighting question.

I'm soon going to replace my front bumper with a steel jobby to improve the approach angle. As my disco has front fogs this is going to leave me with a spare switch in the cab attached to some wires. I was wondering if I would be able to re-route these wires up to the roof and power 4 spots on a bar using the foglights' wiring and switch.

Does anyone know if this would be feasible or would the current draw be too much? If so would I be able to do it if I stuff a relay into the mix?

Any help much appreciated.

Extending the wiring for two roof lights will be ok, for the other two you will require an additional relay, switched by the fog lamp circuit, plus an additional fused feed to the lamps via the new relay.