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Is there any reason why you were looking at a dual footswitch? I'm assuming you would have needed just the one? If that's the case you totally could make one, literally a spdt (or dpdt if you want an LED) which opens or closes contact.
If it's a case of controlling the reverb on separate channel my guess would be you'd just need to wire it for use with a stereo jack. The two switches would then share one contact (let's say the sleeve) and then one channel would use the tip and the other the ring, again making or breaking the connection. Hope that makes sense?
My amp has the option of adding a footswitch to control reverb. I've been reading and I think this will work with my (non-Laney) amp:
https://www.amazon.co.uk/Laney-FS2-MINI-Button-Footswitch-Amplifiers/dp/B071FQG3W5/ref=dp_prsubs_1?pd_rd_i=B071FQG3W5&psc=1
However, I could just make one right? Is a simple on/off footswitch easy?