Swype for Android won't work in Harmattan (I think).
I think Swype could work. I know for certain the early versions will work because they didn't incorporate the phone version into its code, but they lacked some dictionary words and had some bugs. The new version is pure awesomeness, but they need a qualifying build.prop to work otherwise it crashes. It can be done, and shouldn't be too hard, but it requires a weekend of an experienced dev.