I'd recomend urac, resorcynol, or epoxy.Never tried the tb glues for splices,but if Dano says it works, then there ya go.
Pat, I have dowelled many splices,but not for the purpose of strength,but primarily for alignment. Get a good dry fit,(alingment)drill it,then when ya slap the glue to it,the dowells will line ya up perfect.Probly not needed,Just helps me to get it right.