Not sure I fully understood the configuration and the needs but with my LIFX bulbs and their dedicated app I can create
scenes.
It's very convenient to turn on/off particular lights in one single command (I have a total of 8 bulbs scattered in the main living space : 3 in the living room / 5 in the dining room).
For instance I have a LIFX scene called "Movie time" so when I say "Alexa, turn on movie time" :
+ all 5 dining room lights go off (no matter their initial state)
+ the TV and sofa lights turn on and set to 20%
+ the lounge light (above TV/sofa) goes off
But maybe your Sonoff equipment does not provide such a feature