Your question: “Can you show where this is supported in the Word?”
Luke 23 Do you remember the story of the good thief who died next to Jesus?
* Now one of the criminals hanging there reviled Jesus, saying, “Are you not the Messiah? Save yourself and us.” 40The other, however, rebuking him, said in reply, “Have you no fear of God, for you are subject to the same condemnation? 41And indeed, we have been condemned justly, for the sentence we received corresponds to our crimes, but this man has done nothing criminal.”v 42Then he said, “Jesus, remember me when you come into your kingdom.”w 43He replied to him, “Amen, I say to you, today you will be with me in Paradise.”
That does not support *baptism of desire*.
That is an example of being saved by grace through faith.
The thief put his trust in Jesus, without ANY works.
The term is not found in one place in Scripture.