In my opinion, this is a really solid proposition for the DLC.
I would suggest such non-European DLCs (so as not to deviate from the topic in a sense):
- your Indian DLC proposition
- South American DLC - Chimú civ and Muisca civ
- Caucasus DLC - Georgians, Armenians and Khazars
and two big DLCs similar to the good old DLCs:
African DLC - Congolese, Kanem-Bornu, Songhai, Zimbabwe and Mamluks
The Forgotten 2.0 - Tarascans, Siamese, Tibetans, Finns and Irish