Hmm, probably of not much use to those that already have a D5, but I looked at one here in Thailand just last week and asked about this Ad-Blue problem as it is not readily available here. The answer is that when somebody orders a D5 they import it from the factory without the Ad-Blue system. Now whether or not it is still there and just disabled I do not know, but it comes from the factory without the need for it. And yes, emission standards here are supposed to be Euro 4.
I do not know just what the fitting on the LR bottle is, but it should not take a good engineering shop much effort to convert or make up the fitting. Connect it to a flexible hose and use a garden type pump up spray bottle for the Ad-Blue. Those things are available in metal and various capacities.

