The Fone board doesn't have a lot of volume so would be hard to paddle in unless you are tiny. It is also a very kite specific board with regards to shape, concave bottom etc. I have seen some people getting custom firewire boards that can do the job for both, but then just about any short board you can paddle in will be ok to kite on. Some of the Slingshot boards can apparently be paddled in but would be hard work IMO.
^^Those boards look good, the carbon one looks stealth. I like the foot strap system, quick and easy