Is it unprofessional to shave my head everyday in a corporate work environment if I'm not bald?

Absolutely not. It would be unprofessional for someone to consider it unprofessional.

Can you do the work? Can you perform? Yes and yes? Great. I’ve hired people with blue hair because they were the best engineers I could find.

A company that’s going to hold a hairstyle against you is a company that will favor conformity over originality. Stay away from these companies and you’ll have a more fulfilling career. Because you’ll worry less about fitting in and more about delivering value every day.
Good luck with everything.
Source;
https://hairstyle-en.com/unprofessional-hairstyles-for-women-ideas-2021-you-need-to-pay-attention/