You know, I heard a really interesting reading that suggested that Forster made Fielding a representation of himself - like Fielding, Forster did not see Christianity as the all-encompassing religion that could explain the mysteries of the world. By that same token, Fielding and Forster were outcasts in a highly facile and vacuous society (The Club) - Fielding for his liberal humanist views, and Forster for his homosexuality, something not particularly "tolerated" in England at the time.
For Mrs. Moore, on the other hand, I personally believe that she is an Oriental/Hindu, and like Godbole, she manages to survive India; by that I mean, she leaves India in the same fascinated state she arrived in. Similarly, there's this very non-Western idea of reincarnation that is applied to Mrs. Moore; as you mentioned, she reappears in the courtcase as "Esmiss Esmoor", the Hindu goddess, but she also reappears in the form of her son, Ralph, who also shares the same timidness and "premature aging"...
I mean, does that sound too far-fetched?