This is a pretty solid, simple idea, gotta say. Of all the "quick website" apps, this approach seems like it could get a pretty good result from the get-go, given a good amount of social media / website information available for the business.
I've seen https://milkshake.app, https://onuniverse.com before and walked away impressed. https://glideapps.com is in a similar domain, but for apps.