It's always a dilemma trying to reorganise something after such a long time, already or almost too late, instead of considering future problems right from the beginning. Have no easy solution either, just wanna mention two little points:
If I see it right, the single topics have no subforum key in their URL?
That would mean externally stored links keep working, regardless if topics are later moved around to other subforums (RT browsers? Mozilla browsers? Whatever? Back and forth across forum?) The most important thing is just to have separate topics at all. And not breaking stored links is especially important for those Help-Support links of course.
Not sure if you discovered already one can just open the forum with this very handy link, named "All Activity", and it shows all recent posts?
https://msfn.org/board/discover/
RT is already posting in a variety of different topics across the forums, that looks like he's simply watching "all" too, not just "monitoring single topics" (which would be a pain of course)