Xamarin.Forms to Platform specific UI

Hi,

So what I want to know is basically what is the best way to write a UI using forms only, like a prototype crossplatform version, and then move to platform specific UIs. I'm trying to determine what the best strategy is to save me time down the line. For instance, if I have bindings from the Forms UIs to classes in the shared PCL, then when I switch to Android specific UI development is it just a question of redirecting the bindings? Or, is there a better strategy to make that integration easier?

Thanks!