"so advertising or donation deductions are unneeded"

The local United Way can send their executive or liaison, or that charity might have a person, to review the options. For instance, the concept of "donation" for any business except a C Corp is not really a good method at all, since those businesses don't have Charity Giving for tax returns. The concept of Advertising won't fly if there clearly is no intent to profit from the activity's impact/result. And the concept of including this as part of selling means there would be "consideration received" for the donor = the value of the food, so their giving is not a deductible donation for them, much less this restaurant owner.

All of their intent is great. All of their concepts are typically missing the mark. A professional in the Not For Profit network in the community can review this with them.