I remember there is an asset to quick switch build target. It promises to keep the data files when switching build target, so that it doesn’t cost that much time to switch back. But i can’t find that asset. Do you know what the link is? also, if you have used it, how do you feel about it?
I think you are referring to http://forum.unity3d.com/threads/fast-platform-switch-one-button-no-nonsense-ultimate-time-saver.200652/
but it’s been deprecated and is no longer available on the asset store.