Yeah, not a lot of enterprise tools, but then again, android is more client based for accessability.
If I were to try what you want to do, I would,
1. Root all devices
2. Install a stock 2.2 froyo or Gingerbread.
3. Configure with apps and such
4. Install Titanium backup and back up all apps to SD
5. Do your Nand backup to sd and make sure you copy the stock Froyo zip also in the root directory
6. Use the sd to flash the other tablets, and if things go awry, you can flash the stock froyo zip
This would probably work, although I would try it on a non critical tablet first
I know you wish to avoid rooting, but, it seems logical to try this method.
EDIT: At the least, you can use Titanium to back up the apps, and use the backups to restore to each device. Saves downloading and hopefully configuring each app.
One more important note, always do an original backup before doing anything. You can have several on your sd card.