In reply to Thomas Hardbattle:
I'm going to start with the caveat that this is sketchy advice so take at your own risk.....
As long as the crampons you use have straps and not wire bails you can fit them to almost any shoe. My wife used a pair of standard leather walking boots (as they were comfier than her winter boots) with g12s for years on lots of Scottish classic easy routes with no issues.
I managed to strap a pair of petzl irvis to my approach shoes earlier this year to get up a steep icy gully. It was quite unpleasant as the shoes were so bendy and i wouldn't recommend it, but it just about worked.
Basically it depends on the crampon attachments and how much stiffness you want from the boot (I.e. snowy walking bendy is fine, steep front pointing arrggghh, yer gonna die)