Check BitcoinArmory/extras/createTxFromAddrList.py.  Also sample_armory_code.py in that same directory has a lot of useful stuff.  Admittedly, some of the examples, including createTxFromAddrList.py, uses an old version of the blockchain utiltiies -- for instance, BDM_LoadBlockchainFile() no longer works/exists.  If you see this:



Other than that, I think everything is the same, so you have an almost-full solution there!  Also check extras/cli_sign_txdp.py which can be used on the offline computer to load your wallet, load an unsigned transaction, unlock your wallet, get your confirmation, and then sign it for you.  Try it out!  I made both of these to help scripters like you