Your position doesn't make any sense. How can the dead receive baptism, which is a sacrament for the living?
Before the resurrection of bodies, they are merely souls. How can a soul without a body receive baptism?
Matthew 27:52 And the graves were opened: and many bodies of the saints that had slept arose,
27:53 And coming out of the tombs after his resurrection, came into the holy city and appeared to many.
We know that
many OT Just arose with their bodies
and appeared to many after Our Lord's Resurrection. I do not think this necessarily means that
not all souls of the OT Just were united with their bodies, but that
not all "appeared to many". If you see any error with theorizing that all of the souls of the OT Just were united with their bodies in order to receive Baptism, I am interested in reading it