Sounds like a good system. Would it have been secure enough to prevent the fraud in Cook County in 1960 or King County in 2004? Would Nixon and Rossi have been elected under your system?
My point is that security of any system is some combination of hardware, software, and procedure. To say that a system "can be hacked" does not give me a complete picture. We know from the Kennedy and Gregoire electoral success that indeed paper ballot systems can be hacked.
No, I don’t believe it is 100% foolproof. But in order to commit voter fraud someone would have to compromise both the electronic record, recorded when the ballot is slid into the ballot box, and the paper record. Makes it a little harder but not impossible. I think the greatest vulnerability would be illegal voting or ballot stuffing. Photo ID for voters is not required. Each polling place has a printout of all registered voters for that polling location. I simply sign next to my name on the printout and take my ballot.