How may I install an Android System Image not available on Google Downloads?

I happened to be working on an Android application written around *2010* or so and the target OS is Android Cupcake. The application was written for very old hardware and still runs fine on those (it is still currently in use). I am hired to write a new feature for this application and from the description of this feature, it should run flawlessly. But I can’t seem to find the right tools that will make my job easy. I badly want to use Android Studio because I am used to it. But Android Studio doesn’t have Android Cupcake system image for x86 processor (in those days, Android was written for ARM processor only). I have an x86 Android Cupcake system image that works (please don’t ask how I got it because it is a very long story). I want to setup an AVD and use this image as the underlying system image but I’m lost. Has anyone done this before?