For an iota of what it is worth, I _genuinely_ am happy to see black candidates. If anything I have a heightened sense of fairness and post interview I offer to spend extended time to attune them to the next interview rounds. In case I do happen to reject the candidate, I offer to write elaborate review from my notes (I take a lot of notes) with the hope it helps the candidate. Again, sorry.
On a serious note, to keep a long winded answer short, I'm well aware of the phenomena that your mindset does indeed effect your behaviour/signals you put out and that in turn does effect how people treat you, and mindset is not something that can easily be faked. I've always been hyper conscious about this going into interviews and have even paid for some in-person mock interviews at some point in my career during a rough patch to spot any anomalies/negative vibes I may be giving off.
I wish there was a tactful way of requesting non-Indian interviewers, but there really isn't. There is no bigger waste of time than when you receive an interview schedule and see the names of the interviewers and 4/5 are Indian. Earlier in my career I'd go for the practice but I wouldn't even bother now tbh.