I happened across this switch for lighting......it is waterproof but may not be the best size for a bike.  I did think the wording printed on the switch was pretty clever.  You can also order is with other printing for Zombie Lights, Rock lights, etc.

Where was all this cool stuff when I was adding lights to my car?

https://www.superbrightleds.com/moreinfo/rocker-switches/led-rocker-switch-wi...