Change Manager is a good solution. (well for me). We use change manager to manage and patch our Sun Servers. Best part is its revertable. Im not sure whether you have a Licence for change manager provided by your Vendor or Sun but you can give a try.
http://wwws.sun.com/software/solaris...mentcenter/cm/
My Second thought is to have Cron to run the biz for you. The patch placed on a Central NFS Area and run cron to patch all the Sun Servers without mannual supervision.
Anyone else with similiar thoughts ?