racer /jsz -(... Pt 2

Then if necessary, cut off any Robnet connector at the j-box end, and easily wire it in there on top of the existing AP11 wire connections. I'd think the 7 meter cable should be plenty long enough but you decide if you need longer. If you were to replace the lower control with another AP22, you could just daisy chain between the lower control had and the upper with the Robnet cable , and just have the lower one run to the junction box.
You'll like the AP22
much better than the AP11 due to that wonderful course correction rotary knob you can steer with.
But I'm just a boater not an electronics expert so take this for whatever its worth.
-S