I'm not familiar with fords, but the one you mention is relatively modern so you will be able to rig up any configuration you like or need. Your friendly local agricutural engineer is going to be your cheapest route...if he is like the bloke round our way chances are he will have any spool valves you need second hand in his shed.
What I would say is , the mod could easily cost a few hundred pounds, I personally wouldn't do it until you actually have an implement which needs it, as it can easily be done at any time, and depending what you buy the requirements could vary for flows returns and their positions.
What I'm trying to say is you could pay for expensive additional pipes which end up being not needed or in the wrong place. Get them fitted when you need them, when you will know exactly what you need.