I don't know how much this will help. I made a custom dash insert for my mud truck and wanted to move my fuse block for reasons related to mud and water. You can't see from the pic but I untangled the box while I had the dash and steering column out and mounted it just to the left of the steering wheel and made a cover. There was enough wire to do this. There should be enough wire to possibly mount it lower on the bottom part of the dash left of the column if you or someone could fabricate a bracket. Maybe you can access it from outside the truck at that point.

From reading your posts over the years I thought you had some kind of disability and I apologize for not knowing what that is.