That's all good info, but on my setup my

- roku ultra

Plays hdhr streams through plex with direct stream mode or whatever they call it. Pretty sure that means the hdhr app could as well, unless I'm missing something here.

Will the official roku app ever work with the HDHR prime?

If not, ate there alternatives that might work with upnp/dlna?

Screen share from phone or iPad works but that seems like a sort of ridiculous round about way to get playback on roku.