If the machine has no non-volatile storage other than the two cartridges which are locked in it, and if many eyes are watching closely when those cartridges are installed and again when the machine is opened, what exactly is one going to do with the flash drive?
Figuratively speaking of course in reference to the stik. Any electronic scheme can be cracked. Wholesale changes to contents can be done instantaneously.
Over history I know of no instance where paper ballots have never been cracked en-mass. In cases where it has been attempted it is discovered because of the large cartel of conspirators needed to do it.
I go with history.
Me I love electronics. E-Voting is nowhere near ready for prime time.