I'm surprised you don't have auto start on the control panel for the charging system, this would be used for low voltage starting to recharge batteries.
I needed to be able to have the RV start if the power went out and the temperature climbed.
I installed the wireless system from Onan on my 2002 Windsor
Very simple. You buy the system and a "Y" connector that goes on the generator. You take the wiring harness apart on the generator and put in the "Y" connector, and mount the control module on the front firewall. You then put the wireless unit in the RV but it has to be connected to a NONinverter plug so that it can sense if the power goes out. You then can set it to start either with low voltage or temp.
There are several places to buy if you search Onan EC-30W
I had to move the wireless unit up closer to the front to have better communication with the base unit, this is a known issue with this model. The do also offer a hard wired unit but it's harder to install.