I think it can be done. Just issue the card for “healthy and nutritious food” with an explanation of what that is. No soft drinks, no candy bars, cookies, cake, sugar, salty or greasy foods.
And perhaps another list of what healthy and nutritious foods are.
I knew a drug acquaintance that came from money. When it came time to distribute the estate he got a ‘daily’ cash stipend so that he couldn’t binge on drugs. Last I saw he was working at a church thrift store. Good for him.
My brother once saw him walking on the sidewalk. Offered him a ride. Took him an hour away to his rental property and put him to work. It was funny but he did the fella a favor.
Let them eat bugs.
It good enough for the WEF let’s do a trial run