The FAA clearly states that the Examining AME cannot delegate the exam to a PA, NP or other extender or clinical partner.
AME Instructions for the Exam
The AME is to conduct all medical examinations at their designated address only. An
AME is not permitted to conduct examinations at a temporary address and is not
permitted to name an alternate examiner. During an AME's absence from the permanent
office, applicants for airman medical certification shall be referred to another AME in the
area.
FAA AME Guide Version 12/03/2025