I wrote some workflows in vCO that keeps a table of prefixes and last number used. You can call out to it with a prefix and if the prefix is in the table already you get the next number in the series and if it doesn't exist it adds the prefix and you get back 0001 (or however many places you want the prefix to count up to). I am just using configuration elements for this along with a lock. It is working well. We don't use blocking tasks as all of our deployments are initiated with a workflow since we have quite a bit of pre qualifying and post config that needs to happen in our environment and we hate the vCD gui for anything aside from an admin tool. We do allow the vApp owners access to it post deployment with a locked down role that only allows them to power on/off the vApp and vms and launch a console. Any way you slice it I think you will need to have vCO in the mix.
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