I should have read the github page more thoroughly (but I am "busy at work, heh")
Impressive, the concept of the pi "owning" the chipram opens a world of opportunities, like you demonstrate with the videoplayer - maybe the videoplayer already does this.. an Amiga program that opens an intuition "pi screen" (or more?), to which the pi can write whatever it wants (and maybe take input too, when screen is "active"?). I am imagining lamiga-n to flip between Amiga programs and among them, "pi" screens, maybe even draggable...