Nope.

There’s a 28% collectibles tax that you are ignoring.

There was a case a few years ago if a business trying to play gold coins both ways. Iirc they were paying contractors the face value of the good coins but then claiming a business expense on the melt value. I believe they ended up losing in court.

And then there is Greshams law. The main reason people don’t do this is that bad money drives out good. So if you are holding $20 in paper fiat and $20 in gold, your trust in the value of the gold is higher than your trust in the paper fiat. So you’ll preferentially spend the paper fiat first and hold onto the gold.