Add-on View thread by Workgroup only


Well-known member
I am creating a support forum where users cannot see each others' threads.
Admins and Modscan see all threads. No problem default XF.

What I want additionally is to have very small workgroups, usually partners, but could be up to 6 members. These workgroups can all see each others threads on this support forum.
I do NOT want lots and lots of tiny usergroups of 2 - 6 members to manage!

There would be a lead user in each workgroup. So what I want is to link the other users on this workgroup to the lead user - so all linked users can see each others' threads.

Anyone fancy doing this (paid) or tips on how to wangle it?