OK, I can definitely replace the fan blade and run the PWM controller.
How about these?
https://www.amazon.com/Controller-Motor-Speed-Pump-Blower/dp/B075FN4H37/ref=sr_1_6?crid=12YDMCUP1AICP&keywords=pwm+fan+controller+12v&qid=1637776370&sprefix=pwm+fan+controller%2Caps%2C216&sr=8-6
https://www.amazon.com/Wadoy-D-Bore-D-bore-Replacement-Ventline/dp/B07V687K5B/ref=sr_1_25?keywords=replacement+fan+blade+for+RV+range+hood&qid=1637776613&sr=8-25
This is what's on there.
https://www.amazon.com/Motor-Blade-Kit-Range-Hood/dp/B004882JOA/ref=sr_1_33?keywords=replacement+fan+blade+for+RV+range+hood&qid=1637776690&sr=8-33