Just became aware of this topic: yes it can be done with gdisk. I’ve done it on 3 system disks in 3 different machines.
Partition table backups should suffice in case anything goes wrong, see arch wiki:
https://wiki.archlinux.org/title/fdisk#Backup_and_restore_partition_table
If one wants to be extra careful, a full backup of all data should put one*s mind at ease.