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Or what can I do to safely create a new keyed 12v port, or even upgrade my current one to be able to handle that kind of draw?



My suggestion is to use a relay to power your electric fans.
Your fan supply would connect to your battery positive (or similar) and pass thru the relay contact to power up the fans. There would be a fuse inline between the battery and relay. The relay would turn on/off based upon the thermostat controller and that control would get its power from the keyed or non-keyed power.
You can buy relay kits or buy the pieces and custom build one.

This will allow you to power higher current demand devices such as fans, stereo's etc.
Lower current devices such as gauges can be powered from the acc fuse block terminal OR....... up under these Mopar dashes you have molded power plugs that have 3 female ports to plug into. Some ports are hot all the time and some are ignition key controlled.

The clock, glove box lamp and cigarette etc are hot all the time for example.