HELLO bbWOLFY,

I BELIEVE either NNN or 3 pin would work.

NNN are usually a nicer boot than 3 pin and also stiffer , But I think 3 pin would work, Just cut off the front,

Low end three pin boots would be pretty inexpensive as you can find them used and maybe at Xmarts.

Ive surfed the net a little and found lots of boots on sale (very reasonable) at various places that would work.

My back country ski boot (NNN bc) would probably make a good cycling boot and yes they are warm ,for some strange reason I dont get cold in them.

with winter cycle shoes at 200.00+- the CC boot might be a worthy option!

CC foot wear is not much different than bike shoe construction and they are made for bad /cold weather.

"John"