I've only been growing Orchids for a little over a year now but I was an Aquarist for over 50 years. Marine reef keepers sometimes divide soft corals with a sharp knife and Crazy Glue the halves to a wet rock. It sounds a little nuts, but it works. Now I'm wondering if an Orchid could be mounted on a sheet of glass then maybe a little coir or LFS around it. Crazy Glue is only good on non porous surfaces, but there is a more viscous version that might work.