I’m happy to ask there, but then would they have an issue with using wood on their tools? The only options I’ve seen referenced online for flattening (for example) epoxy river tables are massive planers, CNCs, and slab flatting mills.
I was able to find a single lumber mill/shop that has a big planer they lease time on (they run it), but they quoted a 200$ starting price for things with epoxy. It goes up from there based on size and time. I’m not keen on what will likely be a 400$ or more plane job. At that price, I could just buy my own slab mill set, but I’m not equipped at home for that kind of thing.