I think I have done it in the past for a similar situation. Renaming should work. However, I just found this kb, that suggests - setting the expiry date. I never used it before but looks like it's better than re-naming. I think you should try setting the expiry date a week ahead. I no longer have a snapcenter setup to simulate it but you could tell us if that works.
How to preserve a Snapshot from manual or auto deletion
https://kb.netapp.com/Advice_and_Troubleshooting/Data_Protection_and_Security/SnapMirror/How_to_preserve_one_particular_SnapVault_Snapshot_from_manual_auto-deletion