Google Apps for Edu is being widely adopted by an education community recognising the capacity of collaboration to improve outcomes for organisations. This is a developing ecosystem with some of the administration tasks we have been used to with active directory taking place in different ways with different tools. This can be complicated when organisations decommission exchange servers in favour of this cloud-based solution. One of the teachers at my school got married and took her husband's name. We wanted to change her name while retaining all of her documents and e-mail. We have been using Google-sync but needed now to change the account name in Google before resynching to it with an alias address so that she could receive mail from people using her maiden name.
The product we used is the Google Apps Manager. There are a couple of steps to installation and then you need to follow the syntax examples to ensure that the naming you want takes place. We did this to rename the teacher with a new married name after which we could connect to her correctly from active directory where we also changed her name. I wasn't aware of the ability to create an e-mail alias using the same utility but it is there. This your only option that I know about should you have decommissioned your exchange server like we have. Good luck and I look forward to hearing your Google apps manager stories.