Yes, you can do something like this: you can dynamically change the contents of a node, like what I do in AspectMaps. It is a bit convoluted, below is the code that works for me.
If you want to see it in action
http://pleiad.cl/aspectmaps ;-) (There are screencasts, and even a one-click image for you to try if you want to experiment with the feature). There are some examples in the MOEasel that do similar things, so have a look there as well.