zfs discuss - Jun 2009 - Help, I need a simple way how to update zpool label "devid and phys_path"

Hello ZDB Experts,

To be able move virtual disks with OpenSolaris between Virtualization platforms
in automated way
I need to be able update zpool label  devid, phys_path without need to do actual
"import" on target
platform as I describe it in:

Bug 5785] Document procedure how to FIX boot of OpenSolaris manually for P2V or
V2V
http://defect.opensolaris.org/bz/show_bug.cgi?id=5785

So I need a Fast Fix in form of this functionality:

1. Get zpool devid and phys_path, its easy (I can even store this info 
for later us in file)

zdb -e rpool -l | egrep "devid|phys_path"
               
devid=''id1,sd at
SATA_____SEAGATE_ST32500N____________9QE6B3FF/a''
               phys_path=''/pci at 0,0/pci108e,534b at 5/disk at
0,0:a''

2. Update devid and phys_path on concrete zpool (even on imported one !?)

zpool_update_label rpool ''/pci at 0,0/pci108e,534b at 5/disk at
0,0:a'' \
''id1,sd at SATA_____SEAGATE_ST32500N____________9QE6B3FF/a''

Notes:
- In some case like USB disks phys_path can be empty.
- For simplicity simplicity zpool with one disk will be supported, if 
mirror or so on will be detected , command will ail with no modifications

So what can provide me a magical "zpool_update_label" functionality ?

Nice
Rudolf  (VirtualGuru)