Those already exist, or something close to them. The ones used in Dallas County have a printer that spits out a Scantron form that the voter can review. That form is then fed into a separate standalone optical scanner that tabulates the votes it is given and stores the ballot form. The machine the voter makes selections on does not have any active outside connectivity and it doesn’t do any tabulation.
That’s right TX shot down Dominion because they were crap.