It might be an earlier PoD than the OP wants, but there'd be a lot of potential if one was to go back to 1905 or so. Maybe have Lord Curzon seek to combat the 'Bengali Problem' rather differently? So, instead of partitioning Bengal, he seeks to boost the other presidencies and provinces. Building up Madras, Bombay, the United Provinces and the like as counterweights to Bengal? Bengal would still be the most powerful, by dint of sheer demographics if nothing else, but a skilled politician might be able to at least partially construct a narrative of Bengal v the rest. If nothing else, it might scale back the politics of faith in whatever follows, but the lack of the Swadeshi in response to the partition may have wider ranging effects.
Of course, it might fail utterly, but I'd be interested to see what others think.