Having now finished both trips to Morocco and Iceland I can update everyone. In Morocco I hit a fairly bad pothole at about 40mph and it put a very small dent in the front wheel. Barely noticeable and not really an issue. In Iceland however on rocky tracks (F35 through the centre of the highlands) the front wheel didn't fare so well. Got a real bad dent with the rim flattened out and the diameter flattened locally Thankfully it continued to hold air because if not, being unable to fit a tube, I would have been in real trouble. I am going to fit spoked and wouldn't recommend cast wheels to anyone going anywhere other than smooth Tarmac
I am going to sell a silver pair complete with pressure monitor valves, PR4s (part worn maybe 2400 miles) Front Discs and abs ring in great condition never been off road, so when you want some pm me.