What was needed over Asia were LF models, the RAF fought a low to medium altitude fight with fighters optimized for high altitude, Mk V LF's would have made a huge difference and as for the Hurricane, sending pilots out in those things in 1942-43 as a death sentence.Yeah I'm aware of those attempts, though IIRC they basically came to nothing, and I thought the Hindustan effort was about assembling planes shipped as kits, nothing more (correct me if I'm wrong). The Chinese made Hawks were all fixed undercarriage Hawk 75H or M types, and their production ended when the factories were overrun by the IJA. So I think all of the P-36 / Hawk 75 were manufactured in 1940 or prior, or maybe 1941 at the latest if Chinese factories were still making them. And same would apply to any spare parts specifically made for that aircraft, though there was of course overlap with P-40s and other aircraft which used the same engines as the Hawk 75, Wright 1820 Cyclone or P&W R-1830 Twin Wasp depending on type. I think some of the spares and extra airframes that the RAF used came from Iran and other far off places, orphaned shipments that eventually ended up in the UK etc.
Frankly I think if they had managed to keep production going and ramp it up a bit, the IAF could have used some Mohawk IV for a few of their squadrons instead of the Hurricane IIs they ended up flying well into 1945. Spitfires would obviously be much better.