Of course i'd be, but...
Decompiling the appx, easy, it's an archive
Decompiling exe and dlls, partly ok, but hard, as it's not java thus not easy to decompile
Rewriting depends on the decompiled content, will need a lot of reverse engineering
Recompiling, not too hard, not sure
This means the appx could potentially be modified even though I'm not that sure of my skills on that. It also means that the recompiled appx would be unsigned, which means only installable manually (my download script?) with dev options enabled on the target computers.
About the emulator, I just found that: https://www.youtube.com/watch?v=r3a8hiUQCfw
The tricky part is dumping the 3 layers dvd to an iso file. Doable of course, but tricky