If you choose to do this, do only a few pages at a time.
Be assured, your idea, although it makes perfect sense, will be seen by the creepy G crawler and you will be severly punished for your organizational skills.
Unless this move will bring you an eventual increase in standing, ask yourself...is it worth what -could- happen? What will gain by having all those pages have to start all over again in G? Is it broken...or are you fixing something that works?
The big "G" monster doesnt like change. And thats what your talking about here. Change. Well, dont be surprised when the only change you get is a lower Page Rank in a few months and many of your keywords not coming up in the Search Results where you are so warm and cozy with them now.
Only if you see the benefits would put you in a better place than you are now, I would be very very cautious.
How would you like a homepage Rank of "2"? Thats what could happen.
Just call me DOOMSDAY! :0