Just add 1 tsp vinegar per cup of curd to make it sour.

There is one tetra pack called Rich's whipping cream or the fresh dairy cream are the ones that whip up for the purpose.

Here are the urls for them:
Mutton Stew:
http://www.niruskitchen.com/recipes/details.asp?category_id=14&recipe_id=480

Saag Meat:
http://www.niruskitchen.com/recipes/details.asp?recipe_id=90

Here is the url for it:
http://www.niruskitchen.com/recipes/details.asp?category_id=2&recipe_id=479

Here are the urls for both. Paneer lababdar is not kadahi paneer but pretty much like it:
http://www.niruskitchen.com/recipes/details.asp?category_id=40&recipe_id=478

http://www.niruskitchen.com/recipes/details.asp?category_id=40&recipe_id=477