Forum Moderators: open
At some point, you have to choose which keyword you're going to plug on the home page, and which will be the alternates.
Of course, there's always overture and adwords, if you are ecommerce and selling products.
But that kind of traffic is like eating popcorn. Once you start with it, it's hard to stop.
Most importantly you don't want to dissipate your coverage, so it is best to stick with one main kw and hope to pick up one page with the misspelling. Most people, I think, soon discover their mistake based on the SERPs.