I don't see anything wrong with it as long as the diatomaceous earth is freshwater diatomite. Small agregate is often used and doesnt hurt any at all .
But the man says" The best mix to use is the one that Works for YOU"
If you are familiar with the intrinsic properties of the medium you are using then it should be fine.
I think paph guys can play around with their stuff more bec paphs are just such accomodating plants in general...
I see more "will this work or will that work"? instead of "Why didnt this work"?
now when you get the mix down you can start testing your water
and come up with your own Happy Paph juice