You might be able to do this using visual logic. Using a B2B transition, you could have the B2B Out scene director be very long, like 5 seconds. Then the incoming B2B scene director would be the one animation you want. Add some logic to check the other layer when it comes on, you should be set.
Also, how are you triggering these? You could build the timing into a custom control to SeqOut that takeID after the desired amount of time. Since you're on different layers it would be easy enough.
Just a few other ideas.
#XPression