I don’t understand why u r blaming C4 for, group the lights if u want to reduce the clutter, also use Alexa voice scene for complex stuff, am sure you can figure it out, don’t let a dealer do it or the labor costs will hit you hard, that’s easily 40 hrs work, not less than $400-$500, it requires extensive work, take it room-by-room and you will be there.
Also on the controller thing, am not sure it’s a controller limitation!