To be able to opt out of a Voicemail to another extension

We have a business case where a group of rep's has a TF number and a direct number. When customers call the direct number and hit the rep's vm they wan the option to allow the customer to press a digit to opt out of the vm box back to the main customer service number so the customer doesn't have to hang up and dial all over. They would record the greeting to opt out at anytime by pressing "X", the greeting would be interruptible so as soon as they hit "X"the greeting would stop playing and transfer the caller.