Thank you for such an extended message.
I looked into it, and it is not feasible right now to support resizable windows and second launcher activity, which is needed for DeX. Maybe sometime in the future, if there is a strong demand for it.
As for picotron... While it is a neat and underrated project, calling Trinket a "possible app for picotron" is a little bit strange, because it is not an app, but a direct analogue, just for a real hardware instead of "fantasy" one, as they describe it. So it's much more plausible from a logical and also technical point of view to see one day picotron as a trinket app, than vice versa.