Seat heaters can easily be retro fitted by a shop under your seat upholstery.
I hear that some form of seat cushion with heater can be bought and plugged into a lighter plug (12volt)
Eddie Bauer makes a near 100 percent windproof nylon type of jacket that I have and at 10 degrees it cuts the wind quite well. A plug in seat heater and a nylon windproof shell is a great morning addition to your coffee. Just saying.