So you require more than just the telematics swap. That as you say is a simple car program job. But the IMEI number of the unitis coded into the Jaguar remote system. Thus if you change the Telematics your car will no longer be connected to Jaguar, as you need them to update your vehicle record with the new device ID. So a simple swap won't do.
Re the cost, a simple 4/5G capable phone can be had for very little money. Jaguar know that most of their vehicles over 3yrs old are in the second or third tier owner groups, so they can't charge premium prices for a replacement module like they do for initial owners (usually better off persons). So if they did offer a replacement it would have to be reasonably priced if they want to sell any. So in all likelihood they will just abandon us.
The only saving grace may be that Land Rover still use the same systems so they would not have to create a new production line. The more people that enquire the more they may be inclined to provide a solution. That said, most drivers of all makes have zero clue, they just buy & drive. I asked a good friend who had had some trouble with his Audi what engine type was in it, he had no clue! And that is the problem.
