This Pedal is currently available.
Single channel foot switch
Single channel foot switch with LED
Where used: Dual Rectifier - 2 Channel, Mini Rectifier 25, Recto-Verb 25, TransAtlantic TA-15, Tremoverb, Triple Rectifier - 2 Channel.
https://store.mesaboogie.com/products/footswitch-channel-switching-single-button-with-led.html
Fender Channel Switch
Blackstar Channel switch
Bright Onion Channel switch
Fender Channel switcher
Panama Guitars Channel switcher
Walrus Audio WALRUS AUDIO 2 CHANNEL