Modifying RootJoy images?

Solo761

Hello all, I'm a new Iron Pro owner. I updated to fw 3.02 but it's missing some stuff that 3.01 had. Mainly google contacts sync. It's missing needed apk so you have to install it via rootJoy.

This made me dig a bit with 3.01 and 3.02 firwmares. I unpacked them and found these three items in 3.01 (GoogleCalendarSyncAdapter, GoogleContactsSyncAdapter and SetupWizard), copied them to corresponding folders in 3.02 and repacked it to new system.new.dat folder, zipped and resigned (although I don't think it needs to be signed, original signature manifests have reference to non existant files, who knows from which rom they originate).

Would it be safe to flash this file via RootJoy? Only modifications are these three files, nothing else changed.