This is not directly related to Imagevue, although I do have some experience with SEO. First of all, there is nothing wrong with re-directing. Google will understand redirection and will index the domain that you are redirecting to.
I don't think you can set up multiple Analytics for the same website. After all, the analytics will trigger when the website triggers, and that is AFTER the website is loaded on the end-domain. Besides, you can track anything with the same analytics account anyway even if you did NOT do redirect. You should be able to track how many visitors are being forwarded from the domain that redirects, and then compare it to total amount.
If you need in-depth expertise on this topic, I suggest you post in
Google Analytics forum.