also Viking sell a ringdown device for $150 or so DLE-200B that might fit the bill
https://www.google.com/url?sa=t&source=web&rct=j&url=https://jmacfiles.s3.amazonaws.com/dle-200b.pdf&ved=2ahUKEwjou7Pq3fnqAhUHt54KHcflDgAQFjABegQIAxAB&usg=AOvVaw2epHTsiT3QlIvE8g0GepIm