Why not compromise? Have an Ascian possess his dead body's. That way still dead yet also walking around and doing stuff (though would be only a mockery of him). XD
Seriously though, I think an Ascian possessing him or becoming a primal would be dramatic (think of how your character would react) and rediculous (primal haurchefaunt? XD) respectfully. Even more seriously, I wouldn't complain at him being brought back. I liked his character and would like seeing him back.