Cement based orchid growing plaque

[Jerry]

Has anyone seen a cement based product that will support the healthy growth of orchid roots?

I have been working for years to perfect a cement based product that is porous, lightweight, strong and alkali free and can be hand shaped or packed into molds.
I have been growing Cats and Brassavolas on these for 8years and they are strong and healthy plants.
I made a Aztec King mold that I used to make hanging wall plaques and the orchids just love growing on these.
I am thinking of selling either the plaques or just the raw material, I have included a photo of the Aztec King plaque.
I would appreciate any comments, advice or ideas about selling these or the raw material.
Jerry