One thing that can help is to get a good quality IR tint on the windows. My preference is 3M's Crystalline series https://www.3m.com/3M/en_US/company-us/ ... 668&rt=rud
Even the lightest tint does some amazing things. It's a bit trickier to install, but CA ought to have a bunch of qualified installers.
If you can precondition the cabin while still attached to an EVSE, that will help quite a bit. A/c is more efficient than heating. Your biggest hit will be if you do short trips and the cabin can get superheated in between each. Not as bad once it's already cooled down. I wouldn't opt for the all leather interior.