So you listed another way for the third party to be noticed... by the campaigns. Yes, it will mess with the way they run their campaigns, where they spend their money etc.., etc. However, the third party still needs to be more than a pest to the major parties. A viable candidate will do this, large amounts of donations, federal funding so that they can compete with the big boys for air time, etc.
As much fun as this is - I have to get back to work.