Appearing offline to a certain player

There should really be a way that you can appear offline to a certain player for like an hour or something. I have a lot of friends who wanna duo with me who are like d5 and kinda bad, but I also hate turning somebody down. Which obviously can become a large problem for me. I feel like I'm not the only person this happens to. So it would be really useful if that could possibly be a feature so I don't feel like such an asshole.