Baptism for the dead belongs in a temple, built to the Lord and accepted by Him.
Baptism for the dead by the Mormon community was rejected by the Lord because of the failure in Nauvoo. (D&C 124:31-32.) We are not going to cure the problem until the original conditions are met. A temple must be accepted and visited by the Lord as His House (D&C 124:28) for Him to restore the fullness. Baptism for the dead belongs only there.
We cannot meet the requirements for acceptable baptism for the dead on any other basis than what has been revealed.