Hi Rene,
I also own an NX 250, but I don't have any offroad riding experience yet. It's true that you can only mount two different sets of tyres on the original wheels, and neither of them is good for any real mud digging, but I've been told that the Dunlop pair (which I have on right now) is fine for starters. What you can do, though, is put different wheels on your bike. Those of the XL350 will fit, you'll just have to deal with TÜV or DEKRA. Once you've done that, you'll have a wide variety of tyres to choose from.
As for the tank - no, the big Acerbis tank doesn't fit. I've been looking for a solution to that myself, but as of now, it looks like you'll have to find someone to custom-build one for you. Might be easier to take a spare can with you.
Drop me an email if you like, we don't live that far apart. Would be nice to hear if you've had any success in getting more info since June.
Anna
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