Yes, you can move the motor by hand with actively controlled 0 torque.
In my experience 12N14P (7 pole pairs) is by far the most common for skateboard and drone motors.
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Thanks for the reply.
Your comment make me wonder, that I might have interpreted the specifications on poles of these BLDC motors in data sheets incorrectly.
In “old school” definition of motors, you will say, that such BLDC motors in reality is a synchrone motor with permanent magnets. A 2-pole (one pole-pair) synchrone motor will run 3000 rpm (50 Hz rotation frequency) with a 50 Hz electrical frequency. I think it is correct to assume the same definition for these skateboard motors specifying 14 poles. So my calculation from before is incorrect and the max speed of 6000 rpm should make 700 Hz electrical frequency (not 1400 Hz). Therefore I now doubt, that possible audio noise from the electrical frequency will be a significant issue.
I like to ask a bit about how to get started with programming a STM32 MPU like this. Do you intent to use STlink V3? What kind of programming platform do you use - PlatformIO, Arduino, or something else?
I have seen STlink V3 recommended in this forum. But there seems to more versions of it too.