If he spends money and you give him beer it's illegal regardless of how you try to spin it. If he gives you money, it's illegal. If he buys the ingredients and you give him beer, it's illegal. If you sell him a bottle and it happens to contain beer, it's illegal. If you sell him a sticker and it comes with a free beer, it's illegal. If you give him free beer and he drops money in a tip jar, it's illegal. Whatever workaround you think of, the Feds have thought of it first. Are the chances of getting caught miniscule? Yes. Is it a good idea to discuss breaking alcohol laws on a forum that is indexed and searchable by every major search engine? No.
Your choices are to either gift him the beer or have him buy the ingredients, come over and brew the beer with you, and have him pitch the yeast. Even then, you'll need to look at your state's laws regarding the removal of homebrew from the premises and make sure the venue will allow unlicensed alcohol to be served.