That would seem the best idea, but many growers insist that normal phalaenopsis pot culture with extra light is the best way of growing them. I tried twice and wasn't very successful with this plant when I used to grow all my plants indoors (about 10 years ago), probably because I couldn't give it enough heat and I didn't know that it needed more light than phalaenopsis (I've learnt a LOT about orchids growing since. LOL).

They need consistently high temperatures, which I'd guess need to be higher than for most phalaenopsis because I think doritis would probably get "baked" at ground level, where there is less wind and more light than phalaenopsis get in the low hanging trunks of the large tropical forest trees that they inhabit. I mention this because I think you grow most of your plants outside, where it might get a bit too cold for it during the winter months, which can quickly lead to root rot if the compost in the pot stays too moist during a cold night. However, if you can give it high temps all year round, then I would definitely try a rock mixture with added perlite and some bark as well ... maybe add a little bit of sand but I would generally stay away from the sand and the humus as they might retain too much moisture.