if you look at the parents of the hybrid catts you already have, you might notice that many of them have a rupiculous one in there somewhere to reduce the plants overall size.
Its known that the hybrids of the rupiculous ones are much easier to grow than a straight rock crunchin munchkin.
So you probably already have a few in your collection and might not know it
I've been growing L. flava, fournieri, ghillanyi, and milleri for about 3 years mounted on branches about 8"-12" long and about 1 1/2" diameter. They were a little slow to get established, but they're doing OK now. I water them almost every day during the growing season. Here's pics of recent blooms on milleri and fournieri.