Logic Pro 9 Different Automation for different versions of same channel

I'm running an arrangement with a plug-in heavy vocal channel, and would like to have several versions of the main vocal, all playing ( but not at the same time) on different tracks which are playing through the same channel, so I can switch between a few different versions of the lyric and melody, with different automation on each, without duplicating the vocal channel strip for each one and soaking up more CPU.

Is there a clever way to have different automation versions on the different tracks of the same channel without them applying to all versions of the channel as they seem to default to doing?