You've disagreed with my proposal on the basis that one never addresses court clerks as "Ms." or "Mr." in the US, but that's just not the case. They are referred to that way, and are in any case not referred to as "attorney", even in the US. Lawyers are referred to as "attorney" in the US, and not elsewhere.
Here is just one example:
https://www.formsofaddress.info/clerk-of-a-court/ How to Address a Clerk of a Lower Court
—-Envelope, official:
—-—-Mr./Ms. (full name)
—-—-Clerk of the (court)
—-—-(Address)
—-—-—-Which looks like:
—-—-—-—-Ms. Lynn C. Horsky
—-—-—-—-Clerk of the Traffic Court
—-—-—-—-321 Lewis Speedway
—-—-—-—-St. Augustine, FL 9876
—-Letter salutation:
—-—-Dear Mr./Ms. (surname):