Dear Andrea, As you probably know, the src:google-android-installers package also ships 51- android.rules in the bin:google-android-platform-tools-installer package.
Can I "safely" Depends on your package to be sure the file is updated regularly? Otherwise we would have to either "Conflict" or use the system of "alternatives". BTW, can I suggest you to add a script like the existing "update-pciids" from bin:pciutils package. You could name it "update-android-udev-rules" for example. Regards Fab