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No worries, you're not breaking any rules.
As far as using the CAT-V for a pull string, if it doesn't pull easily, it's stapled or snagged. Pulling harder is going to damage it. You mention the existing run is not straight, that begs for snagging and damaging both the CAT-V and any other cable you might try to pull back in.
Is there a closet you could run through?
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