Pushover groups versus individual devices

I’m starting to play around with Pushover notifications. My main first use case is going to be sending notifications to family members whenever the wash machine has finished its cycle (so clothes can then be put into the dryer).

I’ve got the pushover service working, and linked its API key with sharptools to add the service. I’ve created a group in pushover, with my device, my wife’s device, and my son’s device, so I’m using the group key instead of individual device keys.

My question is, are my choices limited to only one of sending notifications to either a single specific device or all devices in the group? Or have I missed a way to pick and choose which devices within a group get the notification? Can I create more than one connection between pushover and sharptools using the same API key, but using different individual device keys, plus the group key?