Good point. I don’t know how to do that, though I suppose you could adapt the embed code to only fire when someone clicks a link. I had a scan through that topic and I don’t think anyone has asked about the challenge you describe.
I’ve thought about this as well, for my site which is on wordpress and uses the wp-discourse wordpress plugin. We have a resource library with thousands of posts, one per resource. We’d like to be able to allow members to start topics in the forum about resources without having to create thousands of topics in advance. So a link to select to start the topic and add the first reply would be great!