XF 1.5 How can I limit access to specific forum based on User Setting


Well-known member
What I would like to do is limit users access to a specific forum based on a user selected option in their settings.

For example...
1. I have a custom user field where a user can select if they are A or B
2. I have 2 specific forums titled A and B
3. If a user selects A in the custom user field in their settings they can access and post in the forum titled A but NOT in forum titled B and vice-a-versa

Any suggestions and how this can be made simple or automated without constant admin intervention?...Thanks