This sounds like a good idea to me. Ill start doing that.
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Regardless of what strat you're using always have your heroes sleeping. They are terrible defensive units. At level 10 BK can be taken down with 12 archers, potentially less for the AQ. And i think this number of archers can probably take down a BK11-13ish.
The only exception would be if you have your heroes positioned within your base where they can not be pulled. And even then i would limit the AQ to guarding as she is ranged and can have a layer of walls to protect her.
Hope this helps!
Barb kings generally aren't the best, but they are one of my best best defences for when I get attacked by a giant healer army, the giants don't bother taking him out so he destroys all of them one at a time 😃
I just leave mine on guard because I get attacked and my BK regens before I wake up.