Hey Tom: This method of heaving to sounds worth putting the boom back on. Do you leave the main up and sheeted in?
No, Charlie. I often use the mizzen to help douse the main. If alone with no one to steer the boat into the wind under power, I'll sheet the mizzen tight and bring the bow into the wind. The mizzen often helps hold the bow into the wind, just long enough to drop the main into the lazy jacks.
Then as I tie the main to the boom, the boat will heave to on the mizzen alone. I actually rides closer to 60-70 degrees to the wind in light to moderate conditions.
There is a lot of misinformation concerning yawls. About half is disparaging, the other half is the magic mizzen group.
I thinks it's a practical sail on the right design for the right sailor.
I've never tried to lie on mizzen alone - hove to - in very strong winds.
I've been pretty comfortable hove to with just the deeply reefed main sail alone, in up to 40 knots at sea, long enough to sleep a few hours.
From a practical standpoint, I think the mizzen alone is too little sail area in those winds, to counteract windage forward, on a yawl like mine.
"I had a yawl once and left the mizzen rig off one year. The boat sailed faster! hahahahaha,...."
If you keep your yawl rig, you'll hear all the stupid yawl jokes as well as a few old salts that can sail their yawl backwards, through MacDonalds.