Why don’t you try it at the local level first, before making it the law statewide?

A:

Because once you see clearly how totally unequal our vote is now, there is a moral imperative to repair it as widely and quickly as possible.

Also: the 31% of voters not affiliated with the two major parties can already vote in local/nonpartisan races. And using equal voting for some offices and plurality voting for others will create confusion for the electorate and result in more spoiled ballots.