As long as the beetles don't appear to be impacting the health of the orchid negatively, then it should be ok.
Out in the garden, I grow some Angraecum and Dendrobium in pots of scoria, and there's all sorts of things living in those pots ...... ants, and everything. And I think that it's these living things in the pot that might even provide some nutrients for my particular orchids, as they've never been hand-fertilised or manually fertilised etc for thirty odd years.
On the other hand, in your case, a positive ID would put minds at ease. So some nice good quality close-up shots could allow a biologist etc to help identify the beetle.
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