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To do it correctly I downloaded the wiring schematics for a 2018. Range Rover sport and the 2020 defender to match up wiring and tapping the bcm. LR-Retrofits is the only one that can handle the ccf editing and updates.
Possible. Practical? Not unless you have to because they F'd up your order. Much cheaper and easier if it comes with the vehicle. If they screwed you, it's doable - but it will cost you $$ & time. Search for threads from @Mark1107 and you will get the links to the company that can help.
I have no order. I'm trying to buy one off the lot in the U.S. (west coast) with it. I am told they are not shipping with it right now, and I'm legitimately asking if its possible to add later. I am going to look at one without it tomorrow.