Default [Q] Instant Mix with local tracks, is it possible?

Google instant mix is nothing new to the world of music players in general, but the main inconvenience is that the generated mix are made with ALL the library (online\local stored tracks). Can't burn all the internet traffic of my mobile provider (2GB/month) for just 60 mins of listening in high quality.

Is there a way to "hack" it to generate the playlist only with the tracks stored on our phone storage? If not I sincerly cannot find an app to generate a playlist and then import it to Play Music.. The Gracenote database and the MusicDNS are fully capable of doing such job but looks like nobody on the app store ever heard of them xD

Habu and Moodagent does something similar but not the "Similar tracks" function.