So here's how I think I can merge Mastodon and Commento:
Mastodon posts are HTML. So I need to do a LITTLE stripping (removing, say, @ mention links), but I can drop your text straight in, user name is, say "Teknikal_Domain (from the Fediverse)" and that's a link to your account profile. Comment text would also probably have a link to the original post at the bottom of it.
Favorites become Commento votes. Only public posts get counted. And I MIGHT be able to make CWs work as well.
The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!