In reply to adamholden:
It's the stiffness of the boots that causes the "discomfort", not the crampons. So if you were to walk-in in comfort you'd need two sets of boots!
I did this in the Andes, but the multi-day walk-in's made it worth while carrying the plastics on my back and walking up in my hiking boots(and I stand by that to this day!). As soon as crampons were needed though I switched to plastics so only took the one set of crampons. We left a cache of gear at the base of the glacier though, so I didn't carry my hiking boots with me to the summit :p