After reading these threads for several months now, I decided it was about time to make my first post. Hopefully I will be getting an ERA in the next several years, but this is not about me, this is about your questions. You have talked about the seat heater issue, and living in Phoenix, I understand your debate to get them or not. We recently rented a Cadillac and it had heated/cooling seats. I did some research on this subject and found the company that makes these devices is
Amerigon. I haven't heard if they will sell to the general public or if they only sell to major car companies, but I figured it's a good place to start.
Obviously A/C wouldn't make any sense with this kind of car, but this little device would cool your seat while you are in it and can switch to a heater as well. You could use one of those on-off-on switches to determine if you want the device to cool or heat your seat. This would make those hot days in Florida more manageable and keep your wife happy at the same time.