70 is quite a lot of dimmers. Do you have 70 individual loads in your home to control?
I just moved into a 2500sq ft home, and while I have only added smart switches and smart bulbs to the top floor at this point, I only needed 8 dimmer switches. The remainder of the lights use Hue bulbs. The ceiling fixtures with Hue have the load and hot permanently tied together, and the switch is replaced with Lutron Picos. The reset of the 3-way and remote switches are actually just Pico remotes, not physical dimmer switches. My Lutron Smart Bridge Pro ties them to the hub and the button controller app lets me program them to act just like they are physical switches to control those loads. This allows you to program toggle, so dim levels are maintained, but you can program hold for the ON button (or any button you want) to quickly go full brightness if you need it.
I added 20 Picos at between $20-$35 a pico, depending on whether or not they could be installed in a gang plate, or needed their own plate. I moved to all Claro wall plates, so my cost was a bit higher as a result. I cannot imagine ever putting over $5000 or more in dimmer switches in my home. Just a suggestion you may want to consider. You'll save a bundle and the family really won't be able to tell the difference between what is a Pico and what is an actual dimmer, other than the appearance, since you won't be using Caséta for your dimmer switches.
