If the cost of attending auditions prevents talented musicians from attending them, then the BSO should offer grants for talented musicians of any color or race to help cover the cost of attending the auditions.
I don’t think anyone can convince me that there are not extremely talented musicians of color who are talented enough to play in the BSO. If it should be proven that musicians were not chosen due to their color or race then heads should roll at the BSO. On the other hand, race should not be a factor for accepting a candidate for the orchestra. Only musical ability should determine who is chosen. Again, my answer is blind auditions!