Thanks Johnny,
It's always possible to use remote touch encoder button TEU001B or TEU001S.
On this button, there is a touch who is the same as the two finger tap function on the screen.
But this is not a ideal situation because the external switch is often outside of the wheelhouse, in a wet area where users are working with wet gloves. A push switch is the best.
Moreover, the TEU001 are rather expensive .... $450