Is tree fern a good medium for paphs and phrags?

[Optimist]

Many of my paphiopedilums are spiking and/or newly growing roots. I am thinking of moving the paphs over to tree fern with maybe a smattering of chunky bark in the mix. Does anyone use tree fern for paphs, or is that a no-go? It seems that there would be good aereation and good moisture retentiveness, and it also looks like leaf litter, but I am worried about how long it takes the tree fern to decay.