How can I randomize letters in a typeface?

I'm wondering if there aren't any methods to make a typeface toggle between a few variants of each letter as you type. I've been looking into the possibilities and realized true randomize features as seen in Beowolf are no longer possible, and it seems like the only way to go is adding contextual alternate features. Is this true? Are there no easier ways?

Mind you, unlike Beowolf, I don't need to randomize the design of the letters. I really just want my typeface to toggle between a few variants of each letter, and a feature to prevent double instances of one variant.