Sacha could swap in for Davis. It's not that different of a formation. Just puts Veron & BWP up top and you have two CM/CDMs to help protect the backline.
It's not a completely crazy formation. And you're right, it's basically not much different from what we have now but I think Sacha is too easy to shut down in that look. I can't see how Veron or BWP get service.
I think the only reason Sacha has been acceptable in this formation we use now is because it's easy for him to get lost with the two guys next to him.