so as an update there are now apparently CARB spouts made for the nato cans.
http://www.expeditionportal.com/foru...50-state-legal
http://www.wavianusa.com/jerry-can-n...le-yellow.html

Right now its $24 for the nozzle but i'm not sure if you could ship the cans without a CARB nozzle. It at least opens the door to them becoming visually normal. Wavain is the only one making them right now. They are the high end cans so the can + nozzle is not cheap at ~$80. With any luck the cheaper cans will be follow suit and flood the market.