Can you actually prove that?
For unless you can (and it looks like you haven’t done so in this thread), you really should avoid assigning evil intentions to the creators of that movie.
After all, as the Catechism says in paragraph 2478: “To avoid rash judgment, everyone should be careful to interpret insofar as possible his neighbor’s thoughts, words, and deeds in a favorable way”…
That seems to be a wrong comparison. You shouldn’t compare your influence with Disney’s influence, but your influence using one strategy and your influence using another one.
Now, using your strategy, you are only likely to affect people, who are not just Catholics, but Catholics that are sympathetic to conspiracy theories of such kind (although it is true that they do not have to describe themselves as “conspiracy theorists”, as you did). And the only result that could count as an improvement over doing nothing can be achieved if they haven’t seen “Frozen”, but would have seen it, and were persuaded not to. Given all those conditions (and that Catholics of such type would be less likely to see the movie in the first place), I’m afraid you’d be lucky to run into a single one…
On the other hand, “infiltration strategy” can let you influence any fans you can reach (5? 10? 15? I have no idea…). And in this case the result is no longer “all or nothing”: you can afford to “plant the seed”.
Given all that, I’d say that “infiltration strategy” is much better in this case.