Kashmiri (Koshur) is written in Perso-Arabic script and in Devanagari; IndicTrans2 and NLLB-200 list both (kas_Arab and kas_Deva). The 2011 Census counted 67,97,587 people with Kashmiri as their mother tongue, 0.56% of India and the fifteenth largest group, up 22.97% from 2001. Jammu and Kashmir had 66,80,837 of them. Himachal Pradesh had 57,050 and Delhi 18,122. The Census groups Siraji (1,24,896), Kishtwari (39,748) and Dardi (25,600) under Kashmiri. By the Home Ministry’s account of later additions, Kashmiri is one of the 14 languages the Constitution listed from the start.
The script gap is the warning. On the same benchmark IndicTrans2 scored 39.7 into Arabic-script Kashmiri and 19.2 into Devanagari, so a model that is competent in one script may be close to unusable in the other. Decide which script your office writes before you test anything else.
For English meetings, the Svarah paper found Whisper large at 6.9% word error rate on speakers whose mother tongue is Kashmiri, against 5.3% for native Hindi speakers.