If you buy something winter and bike specific, you will be paying premium for the narrow market. Flat pedals principally allow you to look into boots made for a wider market with a better performance to price ratio. However, if you are comfortable paying premium, these 45Nrth will likely work, at least on the warmth side. I paid $85 or something for my Hush Puppies boots, S/H included, but this was outside of the season.
Are you using the hush puppies on plastic or metal flat pedals. Don’t the metal pins tear up
the soles.