I agree that something on the lines of Paul's incarnate messiah would be
unviable without a resurrection; who wants a dead messiah? There are other
possibilities, however. A martyred prophet would be possible, or a sort of
proto-Ebionite christology, with Jesus as a man possessed by an angelic
deliverer conceived on the lines of Melchisedek in 11Q13. If (and I emphasise
'if') Phil. 2:6-11 is pre-Pauline, then that has an exalted angelic being
without any mention of a resurrection, which may be significant.