I'm guessing you'd be better off starting your own private group. I can see some reasons why they may not want such a forum section here. The biggest being that it is, technically, a mostly secular concept. One that has a Lot of bad stuff in it, and yes I know there is clean as well, but the site would come across as supporting all of it in general.
Almost every forum suggestion I see is met with 'make your own group'.
Granted it's not my call, just passing on what I can see they would have a problem with and giving what they usually suggest.