Never knew that was there. Not sure what you mean about how to re-assign the playback device for that measure only. I did notice that it seemed to put in the stock chimes sound for me.
Here's a related question - the way I have been doing it is to put the different sounds in different layers. I assign the corresponding map to those layers, yet things don't seem to display correctly. In the attachment, Rack A is on layer 1 and Concert Band Combo on layer 2. Yet it seems to only be using one of those maps for all of the notes, regardless of layer. If I click on the notation style, it say I'm using the concert band combo map, regardless of the layer selected.