There should be no problem teleporting them back. Nothing happens on aging until you take teens out of the sim bin. If by chance you did move a sim in that you wanted to use CMP on, you could teleport him or her back also and continue on.
For the record, I tried it both ways. I teleported an unaged teen sim back from the bin with no problems, as well as a YA sim already living in a house on campus. Both are progressing normally and nothing has imploded yet. *knock wood*