I thought about it and I think this is pretty much the ideal situation.
Let Obama shine. Let him stand up front and center. Sure, maybe it will backfire among the racists. But the MORE he is up there in their faces deep into the Trump Administration, the MORE people see the undeniable difference between a brilliant conscientious Black man with human socialization and that stupid-talking orange buffoon with no moral center, the better the position against the racists is.
Maybe there are some principled Republicans who disagree with Obama's policies. Even I disagree with many of Obama's policies. But no one without an extreme racist edge or a mental disorder can still deny that Obama is a better man than Trump. Every time Obama is on television with his own platform, every time Obama speaks his own words, it forces them to remember that they elected the dredges of the human moral wasteland to represent their party and that the Black man they previously hated is their man's better in every meaningful way.
I don't even care if it energizes the racists. Forget them. It's only the moderates/centrists/rational people who are worth speaking to anyway, and every Obama appearance increases the cognitive dissonance that they are forced to live with. Pound that message in.