This is a bit of a long shot, but maybe someone here knows this. I came across this font project a few months ago that I think was based on a sign the creator kept seeing at a burger place? It was one of those marquee signs but they had used all different letters so it looked really random.
The designer had built a font inspired by that and worked with a developer to make it truly randomize which alternate was used as they typed.
Ring any bells? I can't remember how I found it the first time.