Going to be honest, I don’t know enough about WC to help you with this. If you want ACF fields in the admin I would still look into how to add custom fields to the WC checkout that are independent of ACF and then I would then figure out how to do 2 things.
- figure out how to copy the values from the checkout to acf when it is saved on the front end
- figure out how to copy the values from acf to the WC fields when it is saved in the admin
The answers to how to do those 2 things would probably dictate what type of fields you would use and how you would use them in ACF.
While I do use ACF for nearly everything, sometimes it is not the right tool for the job or requires a lot of work to make it do something out of the box.
