So I don't have all the answers --- but would say this --- the START load on one of those fans on HIGH SPEED would certainly blow your 30 amp fuses....
I think your fuse size is not a big deal - but rather - either doing a soft start circuit ----- or starting on LOW speed and ramping to high...
Now --- the difference in PWM and "Two speed" to me begs a question for controlling.....
PWM is a variable speed controller
two speeds is two speeds
How were the two speeds controlled in the donor? Voltage?
I would think --- that the motors are just simply motors..... and could be controlled using PWM or just simple on/off switch or on/off/hi/lo. For hi/lo you just need to know the low V operation and the high V operation voltage requirement.
Since you now have a manual control ----- have you tried putting a variable potentiometer in the circuit and starting the fan at a lower speed??
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