I am demolishing the wall between two rooms, one with a two way controlled light, one with an ordinary one way switch. Is it possible to bring the two together so they both operate under the control of the two way switch. (SUPPLEMENTARY INFO I only have access to the switches as the rooms above have laminate/tile floors and I am not planning to renew the ceiling. There is just one point however where I can bring the existing switch cables, from the main two way and the one way, together and hope it will be possible to put in a junction box and a new cable to the position of the new master switch)