How do you handle EDM Contact Lists for not for general public?

Hi All, 

Really hoping that you bright lights can help me on the final part of setting up contact permissions for email marketing!

We have decided that we are going to use Contact Permissions for the overall opt in or out & interests to indicate which list folks are opting into. Easy! The interests can be displayed in TNEW & WordFly so it all makes sense to the subscriber if they decide to update permissions or opt out when clicking through from EDM unsubscribe or logging into TNEW account section. 

Then I get to those lists that we regularly communicate with that shouldn't allow the general public to opt into like Media comms. 

We want those folks to also be able to update their interests & of course opt out - how do you do this? 

Ideally those records are in Tessitura with an Email Marketing Contact permission of Yes and they have an interest of 'Media' (instead of the interest that we use for the general public), but we are able to hide that interest from showing in the public domain anywhere unless you have it checked (which I know is not an option as interests can't be displayed dynamically based on record type). If we just add the interest then it becomes an option for everyone to click on & opt into. If we don't add an interest for media & someone is part of the media list when they click on the update interests option from EDM then there is no option for them to uncheck it but remain opted into other lists if they so choose. We have the same question for members - you should be able to update your interests & opt out of member comms without having to completely unsubscribe or allow non-members to opt in.

Please tell me there is a simple answer that I'm missing! One thing we have ruled out is adding a contact permission for these options as we need that single in/out at the highest level. 

Thanks!

Jo