Not as simple as that, for one, the app that creates the bubbles requires Adrenaline to work in a specific way. It comes with its own modified version of Adrenaline that is partially closed-source (not even going to get into the legal issues of that), and the "specific way" the game launches is the closed-source parts of the code. (Originally, nothing of the modified version was open source). Shipping untrusted blobs is not something we like. We could reverse, but at the current state of the VITA scene, it seems we may have better options, like the mentioned app URL. Also, none of the people working on Adrenaline cares about creating launchers.
With the app URL, not only it is a better "standard" (not too many homebrew use this yet, but it is also the way it is done when official apps launch other apps with parameters), it also makes it easier for anyone who cares to create a launcher (or add support to launching Adrenaline v8.0.0 in their launcher), while also making us Adrenaline devs only need to maintain the launch-from-app-URL feature.