Hi Steve. The Squadrons dedicated wholly as "East India" (only 4 actually) are here with dates, I'm afraid not too specific though.
No. 65 Aug. 1940
No.92 1940
No.123 May 1941
No.149 1942.
Hope of some help.
https://www.bharat-rakshak.com/iaf/h...ift-squadrons/
Regards
Nick