Here's the best schematic that I could find of 'The Twin' , Foot-switch digram is bottom left and yes, there are diodes involved. You could probably make up an in-line box containing a diode which would allow you to switch channels. With your pedals I doubt if you want to use the on-board reverb, so you won't need the other diode or switching contact.
I can't read the diode type clearly, looks like 1N4440. Maybe someone else could confirm whether that's a likely candidate. Otherwise maybe 1N4448.
The switch is switching 30v AC (though there will be some drop across the diode and LED), so you need to make sure that the voltage rating of the relay in your switching unit is sufficient.
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Finally got on top of my Helix. Advice to noob modeller owners from another noob.
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