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I've seen a number of arduino and Raspi based PWM dew heater controllers that you can build for under $70AUD
Raspi would be overkill unless you want a web interface.
Essentially its a MOSFET controlled by a PWM pin to pulse the 12v. A few lines of code to read 1 or more temp probes and then adjust the PWM output rate accordingly. The soldering work is minimal and the most expensive part is the box and some Anderson/RCA connectors.
The DIY means you can pick a box that suits your shape and size needs.
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