Yes Insteon micro modules, Aeon Labs makes something similar for z-wave.
But you will have to think about how you are going to wire it because you want constant power (not switched/dimmed power) to those modules and you don't want a dimmer behind a dimmer. So the existing wiring is going to limit you.
The best solution may be to replace all 3 switches with Insteon switchlinc or equivalent and add 2 micro modules (1 for each group).
Otherwise you can consider smart bulbs such as philips hue, insteon LED bulb, LIFX which can be controlled by smartphone/tablet. But they do not have the best brightness. You would also need to remove the dimmer in front of them.