I created a bot like this. https://github.com/driccio98/BotIt
It’s intended for links and I wouldn’t encourage using it for anything else, as you said I think the best idea is to crosspost content that isn’t on reddit on the first place, and just use reddit as a way to measure how engaging is the post.
This is so far a work in progress so expect bugs. But in my opinion, the bot is usable in this stage.