Once linked in a different topic you could see the context in the P&M thread (see example). If locked the chain icon on a post can create a new topic.
Any idea boils down to how they can get implemented, any idea I have myself needs to be researched.
If you are sharing a post, not too sure on this but, there can be plugins written for the forum that add features. So when clicking the share icon as well as create new topic perhaps post reply in existing topic!?
Here’s some info on wiki’ing posts: What is a Wiki Post? - users - Discourse Meta