The loom wiring is either the same for either system, or is different. If different the answer will be a fat No (unless you rip the car apart and pull a new loom wire in, which will costs thousands.
Assuming it's the same wiring and connection block on the back .... then it's possible.
How much ? I'd guess £2-3k
What??? you say, but it's only a £1000 extra!! Well ... taking one of the shelf new and installing it means you are getting a discount on the cost of the standard ... however to get new you won't be trading in your standard one ... so you'll pay full cost. Then there is fitting time, etc.. commissioning and programming ..etc..
No idea if Jag can do. Have you tried calling the Jag Service department ?
I attempted an upgrade on my 2007 XKR and that was going to cost a small fortune (and involved new wiring) and that was with ancient tech ... so I think the answer is it's going to be hugely cost prohibitive.
Given the number of posts on this forum with issues on factory installed ICTP why on earth would you risk doing something like this yourself? Also surely this would not be covered by any warranty, or indeed could nullify the whole warranty for the electrical side of the car! Would you not also have to replace the binnacle clocks etc?