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This may not have the aesthetic or functionality that you need,
but maybe it could be a first step.
My data set was of the form: Country, VotedFor.
I created a dual axis map.
One axis was just a grey circle on each [Country].
The second axis was a filled map with [VotedFor].
In this scenario, when I clicked on a [Country]'s grey circle,
the countries that [VotedFor] it were highlighted.
But the clicking-on and clicking-off is clunky.
Likely something much better could be done
with highlight /filter dashboard actions.
I didn't think of doing a dual-axis map, thanks for the idea!