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so the unsigned tx has is located in the unencrypted data portion of the USB stick and can be accessed after you've booted up a desktop computer from the encrypted Linux OS on the USB stick, correct? but where is the Satoshi client/blockchain that you need Armory to access?
running two separate computers is the very idea of Armory (one for the offline wallet and one for the watching-only wallet).
With my USB stick I could do everything on the same PC:
- boot normally from harddisk: internet connection, bitcoind and Armory watching-only wallet. Create unsigned tx and save to the fat partition on the stick
- boot from USB, sign the tx with offline Armory (this needs no block chain)
- reboot from harddisk and send the signed transaction
whenever the system is booted from its harddisk the wallet on the encrypted part of the stick is securely hidden