The European system is perfectly simple. Motors usually have 6 leads giving the option of using 415v star connected or 230V delta connected. There is no need for the complex N American scheme that seems to have to cater for 115v 230v and 460v.

Theses things were never intended to be converted to alternators so you are restricted to two options with the European system. The N American scheme in its original form is not much more versatile but by digging into the winding and breaking an internal star point you give yourself a whole new set of options.

If you want to do anything with the European windings other than star delta then again you have to dig into the winding. You can split pole groups and make many more options.

None of this is easy, I find it strange that people who are not prepared to do a winding will dive into something quite complex and confusing to rearrange connections. I am fairly happy to do a winding but I absolutely hate digging into an existing winding, I can't think of many things more confusing.

Depends on what you want.  50W, 250W, 1000W?  12V, 24V 48V?
Is the desire just a windmill making "power"?
If you don't want a lot of power and can live with lower efficiency, it should be OK to try what you have and see.

I am against myself rewinding.  It is good to know one's limitations. That is one of mine.
I slap (properly grouped) magnets in about anything and see what comes out, without a rewind.
I don't like having to deal with finding more than the star point, or sometimes the center of each phase.
It is not a great plan, but it almost always works.  At least a little.

Higher KW motors make less volts, but more amps once they get spinning fast enough.
Lower KW motors make more volts at lower RPMs, but the amps are limited.
Lower name-tag RPM (1000?) motors make less volts than higher RPM (1500?) rated motors, but the trade off is again less amps.
A 3 wire 415V motor will make more volts than a 3 wire 230V if the KW and RPM name tag is the same, but the trade off is yet again less amps in the 415V motor.

Six wires lets it be easily connected for star or delta (Jerry rigged works better than delta for me).
Twelve wire motors are better if available because the output voltage is more easily adjustable to suit the outcome.

Only use neo magnets.

More magnet means more volts and amps.

That will not make it simple to build a PMA suited to 2 meter dia blades running at 6.0TSR.  The blades need figured out after the PMA is done.

If that sort of voltage is at a reasonable speed then it may suit 48v. Need more information to help much more.