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All information set for tags is fixed, and can't be changed at run-time. I'd use two different tags - different ids, different description text, same name, and switch which tag is present whenever this circumstance comes up. Oh, and make the tag Ids have the same initial part, like Custom.Foo and Custom.FooModified, so that when looking for "do we have 'Foo'", you can test Custom.Foo?
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