What a dreadful and unimaginative set of suggested names. If you must rename Ross's gull, then why call it pink-hued gull when the name rosy gull would capture that feature in much more euphonious way and would also recall the original name. Similarly, the natural new name for Cooper's hawk should surely be blunt-shinned hawk, comical though the suggestion of aggressive hawk is.
More seriously if you want to get away from names that commemorate Dead Western European Males and the attitudes and history they imply (and there certainly seems to be a case for renaming McCown's longspur at least on that basis) then do it properly. Instead of arbitrarily choosing a new name for its bland correctness, go back to names used by the First Nation Americans and Canadians and use these as the basis of the new names. By nature this would need to be a long process involving a lot of consultation but that's inevitable if you want a credible set of names that birders might actually adopt.