is it that hard?

 

or any switches at all?

 

maybe ur setup is diffrent, but my head unit turns my amp/sub on and off. and by "missle switch", i assume you mean a redguard. we have them on our aircraft on the master curcuit breaker panels. if you go with a switch, youd be better served using a led lit rocker on ur center console. oznium has one that just barely fits with some careful cutting.
http://www.oznium.com/rocker-switch

 

I use a toggle switch to turn on my amps & processors. It's pretty much for valet purposes, as I can leave the switch on and the system still powers up when the key is turned on. It's so easy to do, just wired it into the remote trigger wire that activates the amps & processors.

 

those are circular, the switch holes are rectangular... you cut them into that shape?