Thank you Paul for answer and the link you provided.
As you mention, my chickens as well as yours would jump on a raised bed that height, they're crazy. That's another reason why I think raised beds wouldn't solve the problem.
They have dust bath area and use it, which I'm glad is happening and I also give them treats, but I just don't like seeing any animal not being able to roam around a nice grassy, flowery area.

But still, I guess a wire fence around the beds or an apple orchard where they would have a run for now will have to do the work.
Take care and your Chooks too!
P.S. love this website!
Aida