This is a great tip, but it has one caveat. I believe this will return a 404 (not found) if your instance hasn't pulled the community yet. If I create a brand new community on one instance, go to another, and click a link like the one you've proposed, I will see a 404. Then, if I search for that same community on the instance with the 404, it will find it. I believe at that point, the link will work, although it may require me to click on the search result first before the instance is "aware" of the community.
At least, that's the way it worked for me a couple of days ago. 😅