No, Morphosemphram is all made up by William Wraithe so you won’t find any other sources for the stuff in his books. If you Google “Mobloch” all you will get is information on Moloch instead.
The author claims the information in the book was culled from the Akashic Records so it 's basically just UPG or Unverified Personal Gnosis without any external verification.
I would assume you need to follow the specific ritual in the book. Generally, substitutions aren’t recommended until you at least have some experience with how the ritual is originally set up.