I think that the only way to show the world that a game engine is relevant on a platform (android) is to build a game on android with it that runs at a normal speed - on statistically the most common device (samsung galaxy?).
In that case, scirra could make game jam games to test out its own engine and actually publish them as free demos on google store. Then when selling the engine, include the source code of one of those said games to show people how it was made to run at a normal frame rate.
Does scirra have a google store account? Are they also a publisher?
In the case of GODOT engine, the guys who made it actually made it to make games with it themselves-commercial games, published a number of games to different devices and then open sourced the engine - giving it to the entire world for free.
Their marketting model is different, but their engine has actually proven that it is relevant for commercial games.
In that case, then scirra could get in touch with some of the developers of succesful games on steam made with construct and ask them to share the source file of a level/demo. As for android games, I havent seen any commercial android games made with construct. In that case I have to agree with a lot of people here that the framerate is terrible when run in xdk container. But that was a year ago when i tested it and technologies do evolve. I still believe that html5 will become more usable