Model the cost across the whole route, including the parts that are not the drug: consultation fees, laboratory monitoring, shipping, and the tests you will pay for yourself.
The internal-then-external appeal path is worth pursuing further than most people do, because the external reviewer is not the plan. Internal appeals are adjudicated by the entity that issued the denial; external review is conducted by an independent organisation against the same criteria, and it overturns a non-trivial fraction of denials.
The salt-form point: the statutory pathway for compounding a copy of an approved drug during a shortage applies to the same active moiety as the approved product. A preparation described as a salt form — "semaglutide sodium", "semaglutide acetate" — is describing a different chemical entity from the approved base, and the description is usually there to construct an argument that it is not a copy. Whatever the legal merits, it means what is in the vial is not what was studied.
FDA drug shortage list status is published and is the operative fact for whether compounding a copy of an approved drug is permitted under the relevant statutory exemptions; the status changes, and the change has downstream consequences for supply.
Worth noting that regulatory status in this area has changed repeatedly over the past three years, so any answer including a date should be checked against the current position.
Ask for the written criteria before you submit. Everything else in the process is easier once you have them.