Mark,
You remember where the original position of your batt switch was, on the transom wall starboard. Sounds like a PITA to get to with knees like you describe...
So...if you don't use that 2-tray "tackle center", how about removing that, installing a piece of 1/2" starboard in it's place, and installing a Blue Seas or BEP "mini" switch in the face of the starboard? Open the door, and there it is...
Just a thought...