I don't fully understand what you are trying to do,
if you simply want to unmount/remount the filesystems from the host but not destroy the clone, then you can simply issue umount /KLON/u01 /KLON/u02, and mount them the same way.
if you are going to destroy the clone, then its advisable that this is mounted and the database open, as SMO will:
a) gather the list of datafiles,redo logs and control files from the clone
b) stop the database
c) remove the files
d) umount filesystems
e) remove the entries from /etc/fstab
f) remove the flexclone and update the repository.
There are only a few situations where renaming the flexclone vol is necessary, but this is not one of them.