Changing/Redirect CRM 2013 IFD URL to new URL after deployment

Hi,

    I have configured IFD in CRM 2013 based on Orgname.domain.com. But now the client want to change the name to crm.domain.com. How to change/Redirect the CRM IFD URL ?  

  1 Option is to take the backup of existing orgname DB and creating new org name as crm and restore the orgname db. Then transferring the solutions and creating sub DNS for the name 'CRM'. 

  Any other options for this to change or redirect the CRM URL?

 If I just create a DNS in the name of 'CRM' same like orgname. Will it works for crm.domain.com ?

Thanks