Hi, I can highly recommend Heidenau K60 Scout tyres. I wouldn't fit anything else for the combination of all-weather road grip and off-road use. I'm on my second set which were fitted in Istanbul to replace the Anlas ones fitted earlier in Turkey( these were actually quite good tyres too!!).
They are a little noisier than more road oriented tyres but are good off-road if its not too muddy. Good price in the UK and look good too.
I have changed them "in the field" too, not too difficult if you can break the bead ok. Wear rates are good enough. They do start to crack around the blocks as they reach their wear limit.