It doesn't seem like it would be very difficult to get the kips powervalve sets machined. I'm not a machinist, but what would be the hard part? heres an e-bay listing of a company that has machined powervalves for a kmx 200. I think an aftermarket powervalve will be available as soon as the demand hits a high point - soon.
I know these wont fit an e-series kdx200, but just wanted to show what people are doing to fill the void on these discontinued parts.
http://www.ebay.com/itm/KAWASAKI-KMX200 ... 58b4f9727e
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