Would I be wrong in thinking that it is the ratios that are important rather than the means of measurement?
It seems reasonable to assume that one could replace the term "heaped chefs spoon" with tablespoon, dessertspoon, teaspoon, ounce, gram or whatever.
22 x curry powder
16 x coriander
15 x turmeric
12 x cumin
2 x chilli
0.5 x garam masala
It seems straightforward enough, so perhaps I am missing something.