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Hi. Bad idea. It won't help with rankings. Only will bring confusion to users and, since it's kinda spammy and manipulative, wrath from engine crawlers. Why do you want to redirect specifically? Why not just create a page domain.com/keyword, put related content, make it awesome, build backlinks to that page, if possible with exact or partial anchor text? If you check Search Results, it's far-far-far not always that index page is ranking for every keyword. Hope this helps.