Unfortunately the D4 is far too heavy to be considered a suitable candidate for an EV conversion, at least not one with a practical range.
Also the huge amount of electronic integration would make it an absolute nightmare to get to work correctly, if there's no engine ECM to communicate the correct data to the rest of the vehicle's ECMs.
Also the D4 unlikely to be a future classic.
The vehicles listed above are, and the Freelander 1 is also becoming a bit of a classic, so put your money into a good one of those, and it's almost certainly going to go up in value.