I think it is easier to add a DNS entry to point at this new naming convention and leave the e-smith Apache config alone.
Whomever handles DNS for your home site can make the change for you and push it out.
I am fond of
http://www.easydns.comas it allows flexibility and control of my domain without having to send mail to an ISP and praying they do what you asked, etc.
Regardless, create a new DNS entry and have it point at the stock e-smith URL and you are done.
regards,
patrick