There was correspondence between Sidkeong and Alexandra David-Néel. In a letter by Sidkeong written at Gangtok on 8 October 1912, he thanked her for the meditation method she had sent him. On 9 October, he accompanied her to Darjeeling, where they visited a monastery together, while she prepared to return to Calcutta. In another letter, Sidkeong informed David-Néel that, in March 1913, he was able to enter Freemasonry at Calcutta, where he had been admitted as a member, provided with a letter of introduction by the governor of Bengal, a further link between them. He told her of his pleasure of having been allowed to become a member of this society.