To keep my Embedded VM's more similar to Partner Messaging, I make a 2nd AA, send selector code 7 to *17. In the main AA, make * go to the 2nd AA, don't record any message in the 2nd one. Now you're dialing *7 from the main AA to log into voice mail.

Make a 3rd AA, Selector Code 1 transfers to *8401, which is record he OGM for the first AA, the greeting says "press 1 for thr day menu, press 2 for the night menu" (if you in fact have a day and a night AA). Back in that 2nd AA, 0 transfers to this 3rd AA. Now you can dial *0 from the main AA and change the greeting remotely.