I haven't tried many other AT boots, so can't offer a comparison. The new Intuition liners are the best available for warmth and very light as well. I have super cold feet and have to use toe warmers for touring in temps below ~10 degF, but I think that's the way it would be with any boot. Having some additional room in the toebox (you can create this during the heat molding process) will allow room for trapping a warm air pocket or using stick-on toe warmers. If you have extra space in the boot, you could also add a piece of foam underneath the liner to add another layer of insulation.

It all depends on the crampon. The sole of the Diva is alot like the Spirit 3, and I have had good luck getting crampons to attach to them. That said, regardless, the answer is probably "yes." If you are using a kombi-type attachment system, those types of crampons will fit on almost anything, so you're in luck. If you have have a toe bail with a heel lever, the chances are good it will fit on the Diva. However if the toe bail on the cramp is especially narrow it may not. See if the cramp will fit on a normal ski boot. If so I'd say you're in luck.

The sole length is usually stamped on the inside of the heal (not on the base on the side) of the boot. i.e. my technica's are a mondo size 23.5 with a 274mm sole length. The BD fritschi freeride smalls fit a 245-300mm sole length so your boots should be fine in this size binding, but double check the sides of your boot for a sole length.

That was supposed to say "low volume foot"!

I am 37 - 37.5 in street shoes (USA W7) with long volume foot though not terribly narrow in the forefoot, narrowish heel and slimmish leg. I ordered the Scarpa Domino in a 22.5 which was too small. I ended up ordering the 23.5. Keep in mind that in Scarpa, the 22.5 and 23.0 are the same size shell. Same with 23.5 and 24.0, etc. (This is different than many boot makers.) My guess is you would want a 22.5/23.0 (they are the same shell size). I tend to downsize a bit. IMO, the charts are useless! My impression is that scarpa runs a tad small. Respect the snow gods!

Use the sizing chart.

They work in alpine bindings, but you should probably get alpine boots if you're just skiing alpine. AT stands for Alpine Touring, which means that the heel detaches so you can hike up, and the boots in turn sacrifice some of their stiffness to be lighter and easier to hike in. If you're not going to be hiking, get alpine boots.You may also want to look at the Domina from Scarpa this has all the attributes of an alpine boots IE : Din compatible sole. But is comfortable and has a walk mode for touring , and just makes the boot comfortable all around