Hi!
If I understood what you want, I think that the answer is no.
In my case, I do what you described as a workaround, but I don`t need to start from scratch since the curves tool remembers the state that I left it in the last edition. So, I just undo, I open the curves tool again, the tool shows the image exactly as I left when I decided to save last time.
[]`s
Cheers
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