The premise that cheating is a major risk or issue in job interviews is .... nutty.
Of course, I think that the real answer for that is to use a human to interview everyone. It's crazy to treat potential future employees this way.
I've even had a candidate whisper the question to someone else in the room with them. Seriously, it's ridiculous what some have done.
But what you can say is: "If you want me to jump through all of those hoops, send me a $99 tablet that's already configured for the test conditions you want to subject me to."