Just say you've looked at the PICs and they are unsuitable- then there is no need to question why I recommend it no repeat irrelevant details.
It's still simple. MOSFETS. There are plenty around that will do way over 30A.
The rest is PWM and hence suject to the number of outputs available.
PS - just because I'm using an 08M2 for engine timing, alarms, etc doesn't stop me using an 08M2 to replace 3 NE555 PWMs etc; afterall, its cheaper and smaller.
If your fan 75A?
Make sure you ionclude a free-wheeling dode if needed (to handle inductive spikes).