I totally agree that minimal samples are better. And since it seems that you’ll only be using data streams anyway, the question of which UI framework(s) to support isn’t very relevant for you.
But I do hope that developers of other applications, with regular windows to interact with the user, will find the interaction behaviors such as Activatable and Gaze-aware useful. And then they might appreciate some ready-made glue code for hooking up those behaviors to existing controls.
But that glue would have to be specific to the UI framework, of course. Which brings us back to the original question of which UI framework(s) to support. Anyone?