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If you search amazon for "argb controller" there are a few options. Most of them either use a remote or an external usb connection, but something like this [link]
could convert that external connection to internal so you don't need a usb cable coming out of your case.
Something like this should work for the USB connection (you can also use a standard micro-USB to USB type-A cable and route it to your rear IO). The SATA/fan connectors are together on the same cable and is something you'll have to get from NZXT directly. Open a ticket on the support site, and might as well just ask for both the cables.
you can get em on amazon or ebay, just search usb internal 2.0 to micro usb
Or if you prefer a right angle USB: [link]
How about using one of these?
(Edit: Although I realize that 500mW from the motherboard probably isn't enough to properly charge. Better to get one of THESE that will let the tablet pull whatever wattage it needs from your PSU.)