I definitely understand your requirement, and, really, it’s not that unusual; particularly since we now have “smart” lightbulbs (Philips Hue, GE Link, TCP) which are frequently on a circuit that also has a hardwired wall switch:
POWER wall SWITCH / smart wall switch Socket smart lightbulb
In the case of these smart lightbulbs…
This tends to work OK (but not ideal), because if the smart bulb fully loses power when the wall switch is turned off, the bulb has a default action to turn back on to full brightness when the wall switch is turned back on.
For the GE Dimming Module and similar, I am not sure: The default behavior may be to revive to the OFF status. (Indeed, I just tested using a similar module by Remotec – it’s default after power loss is to be OFF when power is restored).
And, of course, if the wall switch is off, SmartThings has no idea what state the switches or bulbs further down in the chain are and cannot control them (and, even if it could, they don’t have any power ).
So … not an ideal configuration, right?