Well, I suppose you'll be hard pressed to get anyone to commit to your being right, simply because nobody has any real way of knowing for sure.
Especially as Elgar took the answer with him to his grave.
What I do know about Elgar as an individual, is that he'd be laughing his bollocks off at the stuffiness of these so called "society officials", seeing as he had a sense of humour which these people obviously seem to lack.
Who knows. Given time your thesis may be accepted as theory and become the most likely and popular explanation.
Good luck.