Option 2-
Alternative location is to fit charger just outside the back door fed from sub panel.
Drill through from trunking at low level into the back of isolator and fit charger above it.
Harvi will be needed for this option.
There may be issue with Harvi range due to stone walls.
If Harvi does not work a cat 6 external cable will need to be drilled out and clipped around the house to come in by the front door to main fuse board and meter location inside.
22 meters of cat 6 needed.