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Looking at IMDB, the Japanese version was in Dolby.
If you playback a Dolby track on any surround amp, you get a nice 5.1 up-mix. It works because the system is the same, they just called it Dolby for theaters and Dolby Surround for home.
PC playback will also get you 5.1 sound (many codecs do this).
So you don’t need to upmix it, just let the player do it’s work.
The US version is mono, so there’s not much that can be done there.
You could in theory create a new mix using the stereo and surround channels from the Japanese version and the US mono as the center channel… but the edits are different, right ?