Cable routing - conduit fittings?

It looks like the exterior is wood frame with batt insulation? If the wiring doesn't need to be in an enclosed raceway for physical protection, you *could* cut a small hole behind the controller and fish wires up inside the wall cavity to at least the beside cabinet. If needed, cut another hole in cabinet part way up the wall to help fishing the wire up closer to the ceiling, the use a single gang blank cover plate over the hole. Same process for going down into the pass-through.

This way you will only see the controller on the wall. If concerned about the weight of it, attach it to the wall with Oscar rivets, aka blind rivets.