What did Paul tell the Corinthians to do with one in their midst, and to what end/purpose? ... So that the spirit may be saved ...
If you believe that Judas wasn’t Saved at some point, the implication would be that Jesus chose Judas in order for him to fail which would make Jesus appear to be duplicitous.
That’s not a good look for the Savior.
If you argument is that the proof that Judas was unSaved was the betrayal, that would be a self-fulfilling prophecy.