Thanks all, I have some really nice Lake 255 winter boots which they don’t make any more. I need laces (odd-shaped feet*) and the boots have Vibram soles and pukka leather uppers so I’d like to stick with them. They are really good for those get off and walk moments. However there isn’t a lot of room for extra-thick socks.
*I gave away the top Shim model with the rubber sleeve: far too tight.