All the Wersi & Bohm Expression Pedals have the switches, and have done for years.
However the one thing you have forgotten about is the Knee Lever that used to be fitted to Yamaha & Kawai Organs/Electones which would give you the 3rd foot.
Enjoy Life, Play a Wersi

Bill
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English Riviera:
Live entertainment, Real Ale, Great Scenery, Great Beaches, why would anyone want to live anywhere else (I�m definitely staying put).