OK, so the mini toggle replacing the jack is a no go, the jack is mounted on the I/O PCB with the rest of the jacks.
I made two solutions, one is a a 1/4" TS plug with the sleeve solder point cut down to about 1/4", and folded on top of the tip solder point, and soldered to it. I then glued two plastic 1/4" jack nuts back to back and tightened them down over the exposed solder joints, and filled the open portion with liquid electrical tape. This is of course an always on solution.
Then I cut down a plug much in the same way, and soldered the mini toggle legs directly to the plug, and heat shrinked the exposed connections. The amp sounds much better in modern mode.
My main concern however, is not only the fan. It is very loud, even though it does have a pleasant character. But the heat this thing generates is no joke, it could easily be used to heat a small room, I am not joking. So I am in the market for a better solution, maybe a 2:50/2:90 or Fryette/VHT.