Basic Med has some quirks in it when it comes to safety pilots. Because of the way it's written, Basic Med only works if you are PIC.
https://www.faa.gov/licenses_certificates/airmen_certification/basic_med/media/basicmed_faq.pdf
Something to think about - in my situation, as a renter, my rental agreements say that I need to be checked out and approved in order to be PIC of any plane I fly. So, if I want to be a safety pilot and log any of it as PIC, then I have to be signed off for that plane. If I am asked to be Safety Pilot in a plane I haven't been checked out in, then I can do it but can't be PIC (per the rental agreement, FAA doesn't care). Basic Med says it's only valid if you are PIC, so that needs to be taken into account.
From the FAA FAQ:
>>
Q25: Can I use BasicMed to act as a safety pilot, rather than holding a medical?
A: Only if you’re acting as PIC while performing the duties of safety pilot. The
statutory language prescribing BasicMed said it only applies to people acting as PIC.
BasicMed cannot be exercised by safety pilots who are not acting as PIC but are required crewmembers.
<<
edit: I see that the Basic Med deal has been covered already.