How to add default values in Checkout billing fields?

[Craft]

Hello,

To reduce the Checkout form steps, I made all the billing fields hidden (Company Name, Phone, Address 1, Address 2, City, State, and Zip Code).

But, now I'm facing an issue when the client tried to purchase or transfer a domain name, where eNom is requiring the following Administration data to be sent to it for the owner of the domain:

AdministrativePostalCode / AdministrativeAddress1 / AdministrativeCity

Can we create a hook to set a default value for these fields to be (00000 / NA / NA) in the Checkout page to be sent to eNom automatically?