That looks like it may work! I'm not sure if the glue they use in compressed cork is harmful or not. You can probably google it to find out what's in compressed cork. And fert won't burn the leaves. I spray my Vandas down leaves and all when I fertilize. If the leaves burn your mix is too strong anyhow, because you should be spraying fert on dry roots. Don't water first, that is an old method for pot plants that would only apply to orchids if you were using a stronger solution, or if it were a terrestrial orchid. Anyhow, good job!