I’m afraid we seem to be stuck with this. I agree that it is a major disincentive for people in making corrections. I did ask some time ago if it would be possible for one’s own edits to be reflected in Picard even if they were still pending on MB - assuming that one is logged in on Picard - see response here:- Personal interest in adding data - #14 by Freso
I must say that I was a bit disappointed that it fell into the “too hard” category and your experience just underlines my own impression that it is a barrier to a more active editing community.
EDIT: I would add, however, that it is also my view that it is still better to do the edit and put up with the wait, as then you have a back-up if your files get mangled and also others benefit from your effort 
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