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I didn't have the time to think every aspect of your question but what i've understood your fears are correct - that's the main reason no one has done it before - you would have to rework every single window separately.
It's just a lot easier to use the space you have with the original files, try to work your graphics out with transparent areas.
You can't use tags that doesn't exist to us so "ParentWidth" idea wont do :/
So the answer is: it is possible to do but requires a hellawalat of work.
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