Do you have Alexa? I haven’t dived into routines in alexa all that much but am able to add a device to multiple groups. You might be able to do what you want with Alexa routines/groups.
The label of this wishlist item is “maybe-later”, which means its on the back burner for now. If it moves forward then the label will be changed to “researching” or beyond. I did find a similar wishlist item for having cameras being in multiple groups, that is also labeled “maybe-later”. at the bottom of either thread you can change your notification settings on this thread to “watching” so that you can be notified if there are any replies, and more importantly be notified if the label changes.