Radio input appearance for mixed values

I'm looking for ideas on how to design radio buttons that have a second state that means "no change".

So the user selects a few items, similar to how rectangular selection works in Windows Explorer or Finder. In the side panel input fields are displayed that correspond to common properties of the selected items.

For example, all items have can have a "status" property. If I have two items that both have the same status I can display a normal set of radio buttons with the statuses and make the common value checked.

But what happens if item#1 has "published" status and item#2 has "private" status? The user should be able to change the status of both items to "private", "published" or leave it unchanged.

I solved this somehow for text fields and checkboxes but I don't know how to do it for radios. This is how it looks so far:

And this fiddle demonstrates how the user interacts.