"Kneeling falls entirely under right of free expression and social protest. Anyone who tries to decry that it 'damages' the corporation a public figure works for, whether a sports team or a bakery, is an authoritarian idjit. Were I the manager of a sports team, the SECOND one of my players knelt in protest, I'd arrange to meet them, and ask what can help. Public outreach. More sports camps and mentorships for youth in poverty, who are disproportionately darker-skinned (but I'd be careful not to make skin color a requirement-- you've heard this rant before)."
Well, the famous guys are difficult or impossible to reach, for practical reasons. But it's not just them anymore; players on local teams sometimes do the same thing. They can be reached, and so can their managers. Letters to the editor of any newspaper would be another way of publicizing this idea. We can also just put this topic in blog posts. Then if anyone is involved in sports where this is happening, they have a solution to try.