Bulbos are really cool Check out the RVO Care Page on Repotting a Bulbophyllum: Repotting a Bublophyllum Orchid in Bark
Yes, add some perlite to the mix and I would add something to retain moisture. Chopped up sphag is alright as long as you do not keep it too wet. I give our mix ingredients on the link above and in the video. Bulbos like to stay damp, but not wet and should be grown in a well draining mix. If your bulbo is not in bud or spike - repotting again should be ok.
About the ceramic: I would grow in a basket or mount. Ceramic is alright as long as it is not glazed. Orchids need air exchange around their roots and the glazed ceramic will not allow that to happen.
Here is a video too: