I shall do my best to clarify of what I know. I have the note 10.1 2014 sm-p600, wifi only. I'm located in the US. I had android 4.3 on it. I had used Kies to update to MK1 since I had already tripped Knox and don't care. Even prior to MK1, I used Odin'd Cf - auto root, and Odin'd TWRP custom Recovery. For a long time there were nobody developing anything for the tablet. SCOTTS clean ROM undertook the task and made a custom ROM with stock kernel. Then as time progressed Bid Droid entered with a custom kernel. He also made his own rom, but I'm not sure if that is for P601 or p605 models. I refer you to the note 10.1 2014 android development thread for more detailed info. Scott was able to incorporate ML1 firmware into his ROM. Yes ML1, think it was Taiwan, wasn't released in the US but I see no problems as far as country specific or anything on a wifi only tablet. He knows what he is doing as a proven developer. If none of what I am saying makes any sense, I would advise you to look deeper in Note 10.1 2014 android develop thread. I hope this may have helped clarify. I tried to anyways.
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US Marine & OIF Veteran
Phone:Sprint Note 3 (N900p KK 4.4.2)
Tablet: Samsung Galaxy Note 12.2 LTE (Verizon P905V)