People always want faster charging. In the winter slower may be better. You can reduce the charge speed so that it takes longer to charge overnight and that will help keep the battery warmer longer because it will be charging longer. Drop your level 2 charger down to 32KW or 24 or 16KW . Set the over night charge to 70 or 85% and then when you wake up in the morning raise the charge rate to 80 or 90% and turn on the preheating for the interior. This will warm the battery, increase the regen available and the car will be comfortable when you get in. By the time you shower, get dressed and make your coffee the car will be heated up and ready to go. At least for the trip in to work the car battery will be warm and it should get decent range. When leaving work preheat the car for 10-15 minutes so you have some regen and warm the battery a little. If range is an issue turn off sentry mode and the keep summon ready feature. Put the car in chill mode to reduce excessive acceleration. I would still inquire at work about getting access to a 120 or 240 outlet to charge in very cold weather. Many places are getting more receptive to putting in a EV charger for employees and customers now that EVs are getting more common. You might even direct them to the Tesla page on the web site where they provide 2 chargers free to businesses that let customers use them. The business pays for the install but the chargers are free. I would not charge to 100% especially on a regular basis. It is not good for the battery.