A botkit is in development, using Fedify for the federation bits.
I know of two projects that could have a “bot store” in a way. The first is IceShrimp.NET which is working on a plugin architecture .
The second is from Mastodon, a plugin architecture is being created, initially to support quote posts, I think? Not much info there yet.
These things collectively could be used as building blocks for your idea.
Just make a separate Touch ID device, without the keyboard, please.