I think if you joined a group for people dealing with similar issues it could be enormously beneficial to other members. Probably not unlike the way it can be really useful for the newly sober to be in contact with those who have been sober for years.

Me, personally, I wouldn't do a joint session. I don't do group therapy, for that matter. Just not my cup of tea. Still, if you want to help others, I think joining a group could be a great idea.