Have you ever seen the difference in "required torque" between Neo's and ferrites? which one needed more torque/
Torque is an element in mechanical power. Power is equal to speed times torque. Just like electrical power is equal to voltage times current.
In an alternator, more speed gives more voltage (open circuit voltage anyway), and more current output will result in a higher torque input requirement.
If you use more powerful magnets then you will get a higher voltage for a given coil design, and speed. But unless there is current there will not be any torque involved (except to cover other losses such as friction and stray magnetic losses).
In the sort of machines we are discussing, most of the loss at high power tends to be due to the heating of the copper by the current, so it's fairly easy to predict the losses, given a knowledge of current and resistance. The input (mechanical or shaft) power needs to be equal to the losses plus the output. That's because of the law of 'no free lunch'.
So you can calculate torque from this, and be aware that it has no direct relation to the type of magnet used. But neo magnets do tend to allow relatively higher voltages from coils with lower resistance, so they can produce high currents in a short circuit which means excellent braking torque from small alternators. Using neo magnets (or a speed-up drive on ferrites, which has almost the same effect) you can improve the efficiency of the alternator and get more electrical power out for less mechanical input power. But you will still need enough input torque to produce the output power, and if the rpm doesn't vary much then this torque will stall your blades.
As a rule with a simple alternator of the axial type with no cores in the coils, the more efficient the alternator (lower resistance) the more constant the speed. It doesn't need more much more 'open circuit' voltage to overcome the resistance of the windings so it can kick out more current at a speed not much higher than the cut-in required to reach battery voltage. And this constant speed is not suitable for the blades because they need to run faster in higher winds.
Less efficient alternators need to produce higher 'open circuit' voltage for the same output current (so as to overcome the resistance) which means running faster. (The output voltage isn't higher, because some of this 'open circuit' voltage gets used up in the internal resistance once the current flows.) So they don't need more torque whereas the do need more speed. This is a happy situation for the blades because they will be better at providing more speed as the wind increases. But it doesn't alter the fact that the electrical efficiency has to drop in order for this speed increase to happen.
So it's a trade-off. For a direct coupled alternator that is connected to a battery, you can only work well over a narrow range of windspeeds. When the wind is much stronger then you have to either have an inefficient alternator (high resistance) or inefficient blades (stalling).