Tab navigation: Conventional or optimised for common use case?

Our users work multiple hours a week entering address data in a form. All users are considered advanced users.

There are two most common use cases

• a. Always the same and not all address fields are filled in.

• b. An address is inserted by clicking a button

One idea for efficient data entry is skipping

• a. infrequently used fields

• b. all fields

when tabbing through the form.

Pro: Quick navigation to relevant fields with as little as possible tab navigation .

Con: Contradicts first time expectation, resulting in first time confusion and a learning curve. For non-standard form entry mouse input is required.

Would you implement this idea or rather stick with conventional tabbing behaviour? I'm tending towards a no for a. and yes for b. Do you have any experience with this? Thanks in advance!