If I were in your shoes, I'd aim for maximum effect - find the person(s) at the highest tier of management who can appreciate the value this employee contribute

If I were in your shoes, I'd aim for maximum effect - find the person(s) at the highest tier of management who can appreciate the value this employee contributes, and who can do something about it; and emphasize how "priceless" such an employee is to the company and their clients. It's something we need more in society, people like you doing a good deed for a good person. I hope the company is smart enough to acknowledge and foster it.