virtual mizzen?

More Rules!
We like this one, ’cause when was the last time you thought about a “Virtual Mizzen”?? 
Was trying to figure out how to set a deeper Mizzen staysail/spinnaker for VMG running that would not conflict with the backstay on my yawl.
Looked but could not find a rule prohibiting flying a sail with the head from a strop midway on the Backstay, (hauled up by halyard on Main, opposed by a downhaul) or hauled to a low friction ring seized on there. tacked to weather of the main boom and sheeted to stern.
Effect would be to create a Virtual Mizzen.
Is there a rule?
Click here for another (another?) mizzen thread….