I've been using "real lime" which is a crystallized lime powder in the canning section of the grocery. Works lovely.
You can use lemon juice or tamarind paste as a substitute for amchoor in your recipe.
YOu can substitute fennel seed or equal amounts of Chinese five spice powder.
Baking powder is not a spice, it is a chemical leavener.
The origins of 5 spice powder are lost to history.
A good substitute for chili bean paste in a recipe is a combination of miso paste and chili powder. Miso paste provides a similar umami flavor, while chili powder adds the necessary heat and spice.
Coriander is a spice similar to cumin and can be used as a substitute in recipes.
You can substitute fenugreek powder with mustard powder, cumin powder, or curry powder in a recipe.
That depends on the spice mixture you mean.
duc powder
I can't think of a spice to substitute chives, but you should be able to substitute chives with spring onions or small and very finely diced shallots.
A suitable substitute for fenugreek powder in this recipe could be mustard powder or cumin powder.
A suitable substitute for mixed spice in a recipe could be a combination of cinnamon, nutmeg, and allspice.