You could use any Mixed Powder. I made a batch from my averaging analysis here:-
http://www.curry-recipes.co.uk/curry/index.php?topic=14311.msg130229#msg1302295:4:3:2:2:1:1
5 X Turmeric
4 X Curry Powder (I used Mothers Choice Madras Curry Powder here and in the Base Gravy ingredients)
3 X Coriander
2 X Cumin
2 X Paprika
1 X Chili (I used Kashmiri )
1 X Multi (Either Garam Masala, Tandoori Masala or Kitchen King) (I used Garam Masala).
Base Gravy ingredients from my Averaging analysis here:-.
http://www.curry-recipes.co.uk/curry/index.php?topic=14900.msg130125#msg130125 I used the quantities listed pretty much but I did add a couple of pieces of potato (left over Bombay Potato but you could use fresh uncooked).
I used 400 g of canned diced tomato only and no concentrate. You can mix and match here.
I didn't have any fresh coriander leaves or stalks.
I used my last piece of coconut cream block but again, use anything form of coconut or leave it out. Up to you.
This is a pretty common list of ingredients. I think you could use any of the more well known Gravy recipe ingredients.
As for method, I pretty much followed Misty Ricardo's method for Pressure Cooker but I did the final simmer in a big pot on the stove. You could do it all on the stove but it will take longer.
https://www.youtube.com/watch?v=1Eyd3KfEdB4Stages 1 and 2 I did in the Pressure cooker for about 20 minutes each stage.
The big change for me was the chicken. I've never put chicken in a base gravy and I read over one of Chewytikka's very early posts that mentioned how they did it in the 1980's. However, instead of throwing it in with the base, I boiled two chicken frames in water. When it came to stage 2, I used this stock in place of the water to be added. While that was cooking in the Pressure Cooker I cooled and de-boned the remaining chicken meat from the frames. This I added to the gravy before blending and then stage 3 simmer till oil separation.
I then put it all through a fine mesh sieve and removed well over a cup of fibrous material.
Let me know if you have any questions and I'll try to assist.