Perhaps a better question is ''are there sufficient advantages in favor of a yawl?'' since you are limiting your choices severely if preferring a yawl
rig. Downsides of a yawl
rig would include:
-weight in the end of the boat (spars, running/standing rigging, sail, and no doubt ''stuff'' on the mast)
-limited use of the mizzen over the range of wind speed & direction
-shortened mainsail foot
-increased weather helm when you can use the sail
-limited sail area
-the geometry of the cockpit can be altered negatively as there''s more in the way back there
Yawls as I understand it were generated in recreational sailboats from rating rules. Yes, I know Donald Street loves such a rig and also sails engineless. Many of his views are passe'' now as technology, changes in cruising grounds and the choices available on the used boat market have all changed dramatically since he''s productive writing years in the 70''s. I can''t imagine putting the expense of a yawl rig on a boat while concurrently removing the utility of an engine, presuming that the money could help keep the engine reliable (rebuild? replacment? repairs?).
Jack