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...
(or wait for the dev to update the gallery, officially..
... not making any guarantees that this will work, as intended, your mileage may vary...
)