An inexpensive way to go is to buy a set of the Road Magnet Springs from Mike at BWoodyPerformance. He has had Road Magnet (a company that makes custom suspension springs) make some front & rear springs for the KFX700 that have a lot softer spring rate. I have a set on one of my KFX700's and I like them a lot. They are not the ride of Elkas, I am sure, but they are WAY better than the stock springs.
Contact Information for springs:
BWoody -410-676-1042 (ask for mike)
Road Magnet - 410-686-9100 (ask for keith)
See this link.
Gauging interest for lowering springs for the KFX-700 - Kawasaki ATV Forum