change the wires at the stack valves

Omnex only makes a remote system that will work with a Schwing.  I would suggest learning to operate the unit as wired.  If you switch the angle plugs at the stack valve then you also need to change the face plate on the transmitter to correspond with the changes, if not and there is an accident or someone else operates the unit and causes an accident, YOU won't be responsible.  You can do it, your an operator aren't you! 

it's hard to unteach your brain what you've been telling it to do for 20 years. But I managed so it's not impossible.

The standard is what the new boxes are, Main and slew on right side.