having decided to revisit this issue again, i was reading the AWS thread i linked in my OP and stumbled across this post
. it seems like a bunch of people confirmed that if you do the AWS fix (flash 4 files), then upgrade the bootloader, then upgrade the rom, and then flash the modem
(all in that order) everything works and you get CM10.1 with all the correct bands.
so far i've flashed a new bootloader that will be compatible with CM10.1*, and i have the bands i expect to have. i have not yet upgraded the ROM, but i have faith, after seeing the other confirmations in that very thread, that it will work without any issues. android 4.3, here i come!