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Not sure if this is what you're looking for, but this is something I did to choose between series and author sort. I created a custom column that contains the following:
{series:'ifempty($, field("author_sort"))'}
It's possible it will work for you to substitute tags for author_sort. Then create collections based on the new column instead of tags and series. This does the "and" into an "or" part.
As for the dependant title (changing depending on a particular field), that's beyond me and may be impossible.
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