But a simple search on the internet shows that there are a lot of folks who don't want something like this.
Or, I'm offering $10 to you, junkie, to support my party. But if you want to be paid I'm going to use your device/private key/one time code to do it myself. Or maybe you're my employee and we'll have a voting party where I can see you all wisely agree with me.
The privacy of a voting booth where neutral officials who are supervised by all candidates doesn't allow either of these scenarios work.
The described method seems to prevent voting authorities from seeing specific voter's votes, which is useful, but it doesn't solve the "show me you voted for X, or I break your legs" problem.
The voter can remember the position of their own key if they choose to for later validation against the open ledger and can use the others for deniability (if needed).