That's what I thought, I had been also looking at using XPress, but they are moving away from supporting XF. No more updates will come from themehouse for XF products.There are actually a few of them, but the most likely candidate is https://www.themehouse.com/xenforo/2/addons/article-forum-connect
Obviously we're not evaluating based on price, we just want to pick something that has some logically basic features (i.e. automatically create threads for every wp post, put the thread in a forum based on some simple wp category to xf node mapping).
I'd be curious to hear more about this feature if you're willing to post a writeup in the Feature requests forum.put the thread in a forum based on some simple wp category to xf node mapping).