Separate Screen Time limits for Social apps and all other apps

I'd like to configure Screen Time to allow for one hour of combined social apps and all other apps, including websites, and one hour of social apps only. This would allow my child to spend up to two hours on social apps, or to split two hours between social apps and other apps. I'd also like to ensure that, in case of an emergency, they can reach both parents using phone/Messages.

Right now, I have a 1h limit for All Apps, a 1h limit for Social Apps, have Messages Always Allowed, and set a communication limit to both parents during Down Time. However, I'm not confident this achieves the above.