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I used to patch similar to this as well. Single user mode would be better (though I've done it lots of times in run level 3 and survived). Also, definitely split the root and zone mirrors. Just splitting the root disks could mean that your zones could end up on later versions that your global zone - and that just leads to problems.
Also check your /etc/pdo/patch.conf (or is it /etc/patch/pdo.conf? Can't check right now). Change the entry to your amount of non-global zones. This can speed up your patching by a bit.
Another thing I do, when it's not me that personally installed the global zone and and/or the non-global zones, is that before my patching I do a detach and a re-attach (with -u) of the non-global zones so that I know my patching levels of my global zone and the non-global zones are in sync. This can take a while though but it's a good safety net if you do lot of copying of zones from one global zone to another like we do.