How to free up RAM by freezing / bouncing tracks that use Audio Units

As an old time Cubase user, switching to Logic made me ask the following CRUCIAL question: how can I easily free up RAM by freezing or bouncing tracks that use Audio Units (AU's). Cubase has a freeze button with an option to automatically unload the samples for the frozen instrument, very straightforward and a huge RAM saver when working on larger projects.

Although I have found a way to free up RAM in Logic Pro 8, I desperately need a better and faster way. Let's start with my current procedure:
1) bounce the tracks you wish to unload the AU's for (see manual)
2) import the bounced audio to a new audio track
3) go to the mixer in the environment
4) select the desired channel (by clicking the small triangle)
5) on the left window, change the Channel from the selected instrument to off (this unloads the respective AU)
6) do this for each channel required

Here's why I need an easier way of doing this:
1) when opening the project (after having saved and closed it), reactivating the instruments in the environment for the respective channels no longer links that instrument to the AU initially loaded, it just becomes an empty instrument (strangely enough, before closing the project, it does memorize the link to the original AU with its samples)
2) this requires me to select the correct AU and reload the required samples for each channel involved
3) this procedure also requires me to bounce and import the bounced audio file manually

Is there a more automated way to free up RAM in Logic? Freezing tracks doesn't help as it only saves on CPU usage and doesn't unload the AU's. A simple option like "unload AU when freezing track" would be marvelous!