On the Clark you can use the tarp to do the same thing,you can hook the bungie cord on the bottom foot end then bring the head end of the tarp as close as you want to block the wind. It will enclose you as much as you want to with just the tarp. I have use it this way in the winter and don't think the weather shield would have helped much more. I know that condensation will form on the head end so I would think that having it form on the tarp outside of the netting would be better. I went through the same thought process when buying mine. I wish the weather shield had been removable. I contacted them to see if this was possible and it could not be customized. You are going to have more of a cocoon feeling in the Clark than the HH resulting in less air space to deal with in winter. I like the HH in the summer for this reason.
Example of it fully enclosed. The weathershield and tarp do the same thing IMO