It looks like the Honda one was actually only in Japan, but if I am reading correctly they still used the standards from the American SAE which had me thinking they did it in more markets. It was 2020 on the Honda Legend that they first did it, vs 2023 on the Mercedes, but Mercedes was indeed the first to actually get it certified in the US
I am also definitely not coming into this with any expertise, but reading the linked paper about it looks at least somewhat promising to me. The ingredients are silica (sand) and a couple of cellulose derivatives (cellulose being what plants are mostly made of)