Ha, keep dreaming. If you want help or have questions feel free to ask me though.
Correct, :even :odd in this case is only relevant for a 2 radio option. If you had 3 options so choose from, one way to do it would be like this.
Code:
// This is your "counter" variable
let idx = 0;
// This adds a listener when you press a key.
document.addEventListener('keydown', (e) => {
switch (e.which) {
case 49: case 97:
$(':radio').eq(0 + idx).click();
idx += 3;
$(':radio').eq(idx).focus();
break;
case 50: case 98:
$(':radio').eq(1 + idx).click();
idx += 3;
$(':radio').eq(idx).focus();
break;
case 51: case 99:
$(':radio').eq(2 + idx).click();
idx += 3;
$(':radio').eq(idx).focus();
break;
default: return;
}
});