Do you think this would work?
As such you want the tool to filter what is said and not pass everything on by design. This seems to be the problem domain, what to pass on what to withhold, what’s appropriate?
I’d suggest that it’s framed as messages of care something like “care for your loved ones” and frame it as some sweet old aunt that is a bit forgetful but well meaning. In that way the aunt can add words of encouragement also.