So, I'm about to buy one of these little guys.
I've been offered one for NZ $650 for the 20 watt head and matching 1x12 cab.
The only down side of this model is the lack of footswitch.

There's a push button to change from the "Kleen" to "Krank" channel.
Would it be possible to modify that switch and solder a 1'4 inch jack to it
so that I can make a footswitch for it?

Has it been done before?
What will I need to take into account?