I think the answer is not cheaply. Different over head consul part but I think the inexpensive part. The wiring harness and running the wires will not be cheap. I would try and add the item if possible. Its worth a shot. Cheaper and easier to do the old school way. Lots of cool switches you can buy and mount them anywhere. Fog light pod you can have 3 different lights in it so 3 are gone. Small 10" light for the brush bar as LED and lazar so needs two switches. CB and I am full. I can always hard wire the CB if I need the 6th switch.
Past - 87 Suz Sam; 76 ChevBlaz14 Rubi 2 Dr -35's First Auto 4wd. Ox Wht 2dr Base SAS, bumper, Flr-lin, 2.7 aux switches.