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I strongly against of the idea of a private feedback for the reasons that were already named in other answers. No point to repeat them one more time.

But I find an idea of the `Sandbox`, `Workshop`, whatever we call it amazing. 
Moreover in a different community I had proposed something similiar to it by myself. I was quite frustrating about big amount of Qs from begginers who didn't know to write Q properly and were turned down just because of that.

Some thoughts about implementation:

* I think it should be like a chat section cause I imagine discussion about how to improve Q would be active so comments won't fit. But if it is hard to implement best to start with usual answers and comments and change it later if needed.

* A separate category sounds reasonable but I don't think it makes sense to hide it from general view. Those who have no interest in such helping could ignore that category.

* I think that all Qs that were closed should be moved to this new category automatically and removed from there after some period of time. Not certain about this one but I definitely don't want to see closed Q with no chances to improve because they seemed off-topic to someone.

* I would prefer don't have voting system in a new category at all - some people really cares about downvotes.