Thanks for your post, you have mentioned the most important benefits. I suggest before jumping to conclusions an MVP must be developed first. Here is a blog to help you out with it.

https://www.spaceo.ca/minimum-viable-product/

You have mentioned mostly all features, I would like to suggest one more, there should be a decentralized approach to store data to deflect the privacy concerns. https://www.spaceo.ca/government-contact-tracing-app-covid-19/