I have no source for the long sphag, but I have serious issues with the coco fiber. Can't STAND that stuff! It gives me the willies. Like having long pieces of hair in your meatloaf that twine around and you can't get it off. Like cat hairballs mounting.
My neo mount wrapping skills are abysmal, as evidenced elsewhere here. But could you maybe put shorter pieces of sphag in the middle then an outer wrapping of the fiber? It might work as a stop-gap until you can source what you need? I doubt the fiber itself will provide the water retention you'd want or the neo would require.
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