What you could think of using would be the ability to create Virtual P2 cards. This can be done using the Panasonic P2 Viewer software.
Essentailly what the software does is allow you to copy an image of a P2 card to a folder on your computer media drive. Thi image can be of any size and can therefore contain more than 1 P2 card. You can also create multiple Virtual P2 cards so this is how you organise your media.
Once you have created these drives you can directly mount them from your Avid as though they were actual P2 cards. The way to get the Avid to recognise them is to use the Windows SUBST command to map the folder to a virtual hard drive.
Hope this helps,
Brian