fieldsheer highland pants
Fieldsheer highland pants are totally wonderful. I liked them so much I bought a second pair for when the others need washing. They have a full leg zipper, zip out liner, zip vent, big pockets, and I rode in downpours last summer in them and stayed dry on an unfaired bike. They do tend to run small so be sure you check measurements
Everlasting Gobstopper, anyone?
Personally, I don't believe what you're looking for exists; nor can it exist given current technology. The BMW ComfortShell pant probably comes closest, but any fabric that is waterproof is also going to be windproof.
I would suggest either zipping down the leg zips a bit from the top t (o let some heat escape on hotter days, or adding an insulating layer like a fleece pant to the HT Air. Other than that, BMW will be out with Streetguard3 next spring--which looks amazing, though expensive (about $1800 for the suit). The suit incorporates the membrane and armor from ComfortShell with zip-out liners and near UV reflective treatments.
At some point there will be one-piece suits with no bulk that will both heat and cool, and there will be Schuberth helmets available in the US that fit everyone and incorporate a Bluetooth system that is easy to operate and functions perfectly. There will also be world peace at that time.