Hi Jape,
as what you have just described is actually a clear specification for an enduro bike with the opportunity to use a2nd set of tyres like sm.
The original DRZ sm is a very good bike, but is not flexible to change to offroad tyres because of 18 inch rear and 21 inch front for offroad use which does not fit with the lower clearence you have with the adapted sm-suspension as well.
But if you buy a DRZ 400 S it´s the same performance, 40 HP, and you can change for a fair price to sm tyres you can use alternatively.
This way you would get the best flexibility for any likes you would face later and I promise you get´ll the biggest fun...
I hope this helps a bit with your decision..
regards
rainercross