I wasn't able to find fine orchid bark either. And I'll tell you what, putting medium sized orchid bark into a food processor results in medium sized pieces of bark stuck to the blades and an interrogation from the other half. So my soil mix uses medium sized orchid bark, some with blade marks on them. It's to help prevent the soil from compressing, and will still do it's job if medium sized.
I use that same lump charcoal found in your link, practically free in bags that size. Can get messy when broken down with a meat hammer in the kitchen, so best to do that outside.
Take the advice of that second post in your link, wear a mask during all this! The peat moss is also nasty when the bales are dry, once disturbed they spew forth a fine peat mist designed to coat your lungs. If the bales are wet, they're also nasty as they now weigh several metric tons.
My mix isn't really ABG though, I have no tree fern fiber and also include leaf mould from the forest.





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