I do not know if that will meet your need, but I would also propose "meld" (it is in the repos).
Meld is a tool which allows the user to see the changes in, and merge between, either two files, two directories, or two files with a common ancestor.
It is a classic two panel tool and allows you to exclude, include or ignore files to be transfered (maybe wrong but I am not sure that unison does), before it all starts.
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