IMHO my recommendation would look at 3rd party devices rather then trying to get this to work on a Stratagy voicemail system.

Programming by tokens will take some good programming knowledge on Stratagy, and I am not sure of the OPs Stratagy token programming skills. I think that the hourly rate for a tech to try to get Stratagy to do something like this would be better spent on a device that was designed just for this specific purpose.

Regardless of what device makes the announcement, you may want to look at a professional voice talent to do the messages. I don't think any device will come with any greetings that will work for your specific needds.