How would you approach it? Setting up a renderer with global coverage isn't really a trivial task. It is straightforward, and there are reasonable guides, like
https://switch2osm.org/ , but the planet database is just a big database to work with.
(I think I would take advantage of Mapbox's free plan, which allows for 1 custom stylesheet and enough usage to get the image together. I guess there are lots of people who would be happy to render a stylesheet (especially if a modest fee is involved), but I'm not sure how someone on the street figures that out and gets in contact with them)
