The only way I can see to make a fully waterproof front shell is to either build it yourself or find the front end of a dead velomobile.
Plus recline angle and crank length can make a big difference on how well you can see over a nose cone that covers your feet.
In daylight it make no real difference, but in the dark I found with the fairing on it was a lot harder to spot potholes.
Velomobiles tend to have a dip between where your knees go to help with this.
Think about it.
If you have a bad cut in your leg, your put on your back with your leg in the air to reduce the blood flow to the cut.
In the recumbent position you're over halfway there.
The reduced blood flow means less heat is transferred to your feet from your core, therefore they run cold.
That's why as soon as you put your feet, it increases the blood flow and your feet warm up.
I think the best way to keep your feet warm in cold and wet conditions is fully waterproof boots and electrically heated socks.
Also that's why on a recumbent in very hot weather, you cannot remove enough heat from the soles of your feet where the cleats are and you can end up with a burning sensation.
Luck ...........