There are smart switch covers that fit over your existing switches. They are battery powered and have their own on/off buttons. This give you an intuitive wall switch while allowing you to actually keep the power on to the smart bulbs. They work very well. And you can set them up so that the on button on each of the switches turns on all the bulbs. It doesn’t matter what circuits or fixtures they are in, because the on command will be sent from the switch to the hub, and then from the hub to the bulbs. 
You could just buy one for each gang box as long as people know to use them. Then put childproof switch locks on the others so they stay powered on.
See the following thread:
