Well... this >6KRO is a dangerous game.
Get it right, and you may sell more units, but people will not pay more for it.
Get it wrong, and at worst your sales will plummet. At best, you lose a selling point, have wasted time developing the feature, and have egg on your face.
12KRO sounds like it would pretend to be 2 keyboards - that method hasn't proven successful. Besides, if you're going to send 16 bytes at a time, why not use a bitmap, and make it NKRO?