Sounds to me you are creating drama where there is none, sorry for my bluntness.
I see no reason why we should install such a feature for members we invited here ourselves.
We do have a block-feature and it won't kill you if specific blocked member can view your house.

If it does bother you that much, you can use a private forum to protect your works.
I don't believe more features are needed nor the spending of [Hedda]'s time to create such a feature.