$3K seems extremely high, are you sure the shop you're using knows what it's doing? If possible get a second opinion, it may not even be the MFU. On the older Land Rovers this item is called a "Multi Function Unit". [I like Gold Wing Rovers, I've used them several times for DII parts.] Oh, and DI's don't need the reprogramming (if I remember rightly), it's totally different from the DII's "Body Control Unit".

'99 Disco II
'95 R.R.C. Lwb (Gone...)
'76 Series III Hybrid 109
'70 Rover 3500S