I was very tired when I posted last night Hugo and sorry, my word choice was poor. Please allow me to improve it. We know that the BIR method is about simplification and expediency. What I was meaning to say is that your method shows just how simple and expedient it can actually be. I did not intend it as a criticism of your dishes.
After now 14 years of base gravies from every corner of this site and others, what I was trying to say was that I'm now amazed that you can get the same, or better, result by combining 2 readily available packet products. Upon reading your original post, I immediately looked into Shaheen Onion Masala. I've seen it mentioned before and doubt I'll find it here but you never know. What I did find is that onion tomato Masala is a very common shortcut in Indian cooking and there are numerous versions presented online.