You can flash any rom out there for the gnote 3. Except if you somehow found an AOKP rom. Those can't do still. But you just back up your stock configuration. Wipe the stock slot, wipe system, data, dalvik cache and cache, and flash whatever rom you want from the ROM section.
Sent from my GlaDos Baked Potato
Sent from my GlaDos Baked Potato