It is a topic that I tremble at re-starting, but what is so wrong with T-Foils on the rudders? (See the thread from last year...) Like training wheels on a new bike, or something? Looks like a solid idea to me.

Interesting new video here, about 10 seconds in: new stealth video

Looks simple. Sure beats replacing damaged rigging, etc when diving and flipping...

Also, I wonder about the new WETA's ability is nose dive. Looks highly doable...