Soap scrapers out of M&P?

[GemstonePony]

I'm just wondering if anyone else has tried this. I've got M&P on the way for a different project. I'm considering using foam board and silicone glue to make a scraper mold or molds. Obviously, I'll have to soap cold and keep an eye on my temps. The recipe I have in mind doesn't heat much on its own, though the fragrance is rumored to accelerate. And if I'm only able to use the scraper for one batch, that's fine.