I think this is a really cool idea. I think one of the biggest challenges and something to be mindful of is just people actually knowing it exists.

In a perfect world there would be a visual indicator on frontends that signify that a post is using this service so that at a glance curators could hone in on the participating posts.

Knowing that doesn't exist and probably won't ever exist I think the next best thing is to come up with a way to market it. Maybe like a regularly promoted post or something? I dunno. I just think people get into their grooves of the way that they do things and people can be slow to adopt new behaviors. I repeatedly commented on artists to post in Communities vs on their own blogs and even though there were clear obvious benefits a lot of them were super slow to do it and some still haven't.