Asawi, if all you want to do is sideload apps and make your device more compatible with Google Play apps, you don't need to do a total root/ROM replacement. If you just flash the mods from the "Extras" file, that will allow you to do that. That's all I did, and now I can install just about anything. The changes remain through a firmware upgrade too, as I mentioned above.
This retains the stock OS but you can always use a launcher if you don't like it.
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