If a body of flesh could operate in the spirit world, then, having atoned for your sins in Gethsemene, then Jesus did not actually need to die. He could have been transformed instantly and certainly didn’t need leave his body lying around for three days. But we are told that Jesus’ death was necessary for him to preach in the spirit world.
1 Peter 3
18 For Christ also hath once suffered for sins, the just for the unjust, that he might bring us to God, being put to death in the flesh, but quickened by the Spirit:
19 By which also he went and preached unto the spirits in prison;
Jesus’ ministry in the spirit world was restricted to the three days when he was dead. Jesus had to have NO body to preach to the spirits in the spirit world. It was the limited amount of time he was able to spend in the spirit world that prompted Joseph F. Smith’s vision
D&C 138
27 But his ministry among those who were dead was limited to the brief time intervening between the crucifixion and his resurrection;
28 And I wondered at the words of Peter—wherein he said that the Son of God preached unto the spirits in prison, who sometime were disobedient, when once the long-suffering of God waited in the days of Noah—and how it was possible for him to preach to those spirits and perform the necessary labor among them in so short a time.
Joseph F. didn't reveal that Jesus just started his mission at that time, and returned frequently to the spirit world after his resurrection. He reveals that Jesus organised a missionary effort to operate in his absence.
So I can’t accept that a translated body or resurrected body is somehow a universal passport to everywhere as it didn’t work like that for Jesus.