There is one other refrigerant which very nearly checks all the boxes, but with a surprising structure: trifluoromethyl iodide. While non-combustible, it has an extremely short atmospheric lifetime of less than one month, giving it a GWP about half that of CO2 (and used in much smaller quantities).
CF3I is one of the components of R-466a (Honeywell Solstice) which will be the lower-GWP R-410a replacement. I am working with CF3I in a fire extinguishing application.
https://en.wikipedia.org/wiki/Trifluoroiodomethane
https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=93007...