is there a diverter valve model for the control box you have? do you have some spare tiles?
you could maybe fit a diverter box in it’s place and the pipework for the extra shower hose outlet next to it by removing 1-2 of those big white tiles?
It was like this when we moved in so no spare tiles or idea what the control box is. It's already a two way diverter so adding a third would probably require something a bit different (and I do want to try and avoid replacing tiles).
is there a diverter valve model for the control box you have? do you have some spare tiles?
you could maybe fit a diverter box in it’s place and the pipework for the extra shower hose outlet next to it by removing 1-2 of those big white tiles?