Update state for multiple entities on entity activation

I have Somfy (radio) controlled blinds in my house; I have added them to HA as both individual blinds and as groups. But I have grouped the blinds by getting multiple blinds to listen for the same radio signal, not by grouping them in a group in HA. I do this because it looks better to have all the blinds react at the same time, instead of one by one if I do it in HA groups (i.e. out of in sync).

My question is what is the HA way to update the states of the individual blinds when I use the radio groups?

Example: If I in HA “open” the “Living room Blinds” radio group. I want to update the sates of Living room blind #1, Living room blind #2 and Living room blind #3 to also be “open”.