Fortunately, there's a quick & easy way around this: you can manually install official APKs into a normal Android emulator, which provides enough access that tools like HTTP Toolkit can capture all traffic for most apps for you totally automatically, and allow you to edit responses in just a couple of clicks. That means next time the app sends a request like that, HTTP Toolkit will breakpoint at the response, so you can manually edit it before the app receives it. This same technique applies to any app you can intercept: find an interesting request, create a rule that matches it, and change the request or response to instantly test and change how the app behaves.