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OP, you can install an add-a-circuit to the underdash fuse box and run that "hot" to all of the switches.
Run the output of the switches to a relay box under the hood.
Each switch goes to pin 85 of it's own relay.
Pin 86 of each relay goes to ground.
Run a heavy gauge wire and fuse from the battery to pin 30 on each relay. Wire and fuse size should be sufficient to support all of your Aux lights.
Pin 87 of each relay goes to each light, same gauge wire as from the fuse to pin 30.
If these are high-draw lights like halogen or HID off-road lights, then you might want to split the feeds using something like the BlueSea junction box. A heavy wire and marine circuit breaker feed the box, and each output from the box has it's own fuse. That will allow you to use the smallest wire required for each sub-system without risking a burnout because of the large fuse needed for larger lights.