I understand your intentions but I don't think that's a good solution because it will still submit items to the 'news' page that are not always 'up to standards', giving them at least one upvote. That's roughly 25% of what's needed to get an item to the homepage, so only 3 more (bot)votes and it's done, once an article hits the homepage it is likely to stay there for a while. All this would do is add one more bot to the race and thus increase the problem.
Not having those items on the 'news' page would seem to be the best solution.
Really, people should at least read the articles they submit and judge them for content before submitting them to HN, especially when they're associated with the better known (ex)HN'ers.
Probably Sivers, Patio11, Tptacek or any one of the people that seem to be featured a lot here could write an article about 'Condé Nast acquiring HN' (in a desperate move to re-acquire Reddits' audience that has left for HN, thereby realizing the fears of all true Hackers, the proof that this would make 'HN more like Reddit' is left for the reader) (there goes my April 1 post ;)) and it would get upvoted without much consideration.
One possible (technical) solution would be to let the karma boost be dependent on the average of all posts from a domain, submit a 'below average' link and your karma will drop!