I have tried a few brachys in s/h. My experiment has been an astounding failure. All of them, which is perhaps 3-4, have either lost their roots or died altogether. I suspect much of that is due to the temperatures at the root zone, which is really low during the winter. Most brachys are intermediate to warm growers. I'm not saying brachys cannot ever be grown in s/h. I obviously cannot and would never try it again.
A fine bark or CHC-based mix should work fine for brachys. Keep in mind they like very pure water, keep fertilizer at an absolute minimum, and they should dry out slightly between waterings. Never bone dry because that will increase the relative salt concentration. They require excellent air movement during the heat of summer, as they are prone to basal rot.
concolor is probably the easiest brachy to grow, and in my estimation has the finest-patterned leaves in the entire paph genus.