On our 08 Denali I purchased the key fob cover in pink & waterproof yellow, a pink key and a few batteries and another remote on Amazon for about $30.
Had the key cut and followed directions on YouTube to add the key & new fob. The only thing I discovered was that the command to pop the glass did not work. The remote start and all other features were spot on.
Not sure what the cut off is , or if there is one to add a key and remote from Non factory sources on the NNBS. If your successful with your first remote, consider getting the switchblade type key from the Escalade for the rest of your keys.
I’ve really fallen in love w/ the switch blade set up because your pocket has a 9V battery size lump vs a pointy key and fob that catches on my money clip.
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