I have a feeling that setting up a bug tracker is not worth the effort, if only a handful of users will ever bother to use a bug tracker. I've seen this with other projects, where the bug tracker soon withered.
There must be other ways to reach a majority of users, not a small minority of tech-savvy ones.

OK, OTOH, scraping forums and store comments for bugs might work as an interim solution, but this can't be the final solution.
Maybe a simple to use app, that users can use to report problems? With an integrated screenshot function maybe?