What DMX consolle do you want to use ?
If you feel confortable to do Video Mixing using a DMX consolle , you can even use the switcher in DMX mode ( using catalyst serial controller ) .
If I ware you I wount use the same dmx consolle for both light and catalyst .
You problably can do it , it all depends by the time you can dedicate to programm the dmx consolle .
this is my option .