Okay, I did some small edits to dia10.rpy (to allow more of the scenes to be in the replays / catch all possible ends), and added the 4 scenes to the gallery. Here's the modified dia10.rpy (identical for compressed/non-compressed, this is without the walkthrough mod applied...), and one comp_1gallery_rep.rpy and one uncomp_1gallery_rep.rpy . With the last two, download just the one you need, and rename it to 1gallery_rep.rpy and overwrite the one in the game folder...
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(or wait for the dev to update the gallery, officially..
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... not making any guarantees that this will work, as intended, your mileage may vary...
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)