I used a Fender footswitch, simple on/off one, it doesn't have a light but it works well for what I need.
That's what I ended up going with. One of my bands started playing a song with overdrive/distortion on bass and I really didn't want to lose a place on my mini-pedalboard for one song! Yeah, there's no light on the Fender footswitch, but it is as small as you can get and I am assuming it still changes the light colour at the amp, so there is still an indicator of some sort.

