I know someone who, due to ADHD, has trouble paying their bills on time, and managing their money. They found a legal service that handles their basic finances, and gives them their budget for shopping, fun-money, etc.. The service is surprisingly reasonable, something well under $100/month.

While not quite what you asked, a service like this would at least provide an additional barrier, before someone hands over their net worth to a scammer.

The next step after that, often used for elderly people, involves a full power of attorney: someone else is completely responsible for their finances, and hands them either cash or a debit card with a small amount of money that they can use however they want. But that is for extreme cases.