BuddyPress

We are attempting to move a forum of 20k threads from the BuddyPress 1.5 legacy forum to bbPress 2.0. We would like to boil down our 55 “forum groups” down to ~4 parent forums. We encountered some issues with the in-built converter, which we will report in greater detail on bbpress.org. Thing is, we figure we might be better off with a workaround, hence this question.

So, probably through SQL queries, we’d like to convert our groups to tags.
Example: Any post inside “/groups/beta-1-game-contest/forum/” would receive the tag ‘beta-1-game-contest’.

The plan from there is to bulk-move all threads in most groups into just 4 different groups, and from there run the 2.0 conversion.

At the risk of sounding too obvious, you’d want to loop through each group, get its slug, and add it probably as a term in a custom topic taxonomy. Then loop through each groups topics, and add that term to each one.