I don't 100% have that info. Paul was on the Backland in NZ, and I'm 95% sure he skied it with kingpins one day and it did fine, but I don't remember for sure. We should have the backland out any day, it's on the calendar for this week or next and I don't think it will be payed content. (although buying that gear guide is still a good idea... just cause I've got shots in it, haha)
To be honest I don't see why you would go with that combo though. I skied kingpins in NZ with Fischer TransAlps and I trust those as much as I do my inbounds bindings, the limiting factor is definitely the boots, not the bindings. But they are heavy and not designed for quick and light stuff. The Backland is the exact opposite. It's like a freaking hiking boot with tech fittings. The range of motion and weight on that thing are incredible and while it doesn't suck to ski it sure doesn't require a binding like the kingpin.
Also, G3 Ion's are pretty dang sexy. I don't trust em quite as much as the kingpin but they are lighter, very reliable (I did some stupid stuff on stupid snow on them) and not quite as ridiculous to pair with the backland
I would look at the MTN Lab, (check our two reviews) or the MTN Explore for the kingpin. Like Mike said earlier, the backland kingpin combo is a weird miss match.
Ultimate light weight ski mountaineering badass climbing scrambling setup: MTN Explore 95 ski, speed radical/ion w/o brakes, Backland
Ultimate touring/charging setup: MTN Lab, Kingpin, ski of your choice.
That's my opinion at least.
personally this year I'm gonna keep the shreditor 112/full tilt/guardian setup I was on in glacier for inbounds/slackcountry/touring in teton pass and run Steeple 102's speed radicals and TransAlps for everything else.