I've made simple undub mod based on this instructions https://gbatemp.net/threads/how-to-undub-laytons-mystery-journey-katrielle-and-the-millionaires-conspiracy.561278/
Enjoy!
If you want to avoid downloading the USA version from this torrent, because you already have the scene releases, you can use [this script](https://mega.nz/file/dc0wFQKB#PzK-ICuIT3ShzCUZCpyEf9MGBho1_hF9pQ00iUZlL2g) to extract the files, create the patch and convert the XCI to an NSP yourself. It requires you to have [7-Zip](https://www.7-zip.org/download.html), [hactool](https://github.com/SciresM/hactool/releases/latest) and [xci2nsp](https://gitlab.com/roothorick/dedbae/-/tags) (or [4NXCI](https://github.com/The-4n/4NXCI/releases/latest)) installed and the key file saved as `~/.switch/prod.keys`.
Alternatively, you can simply extract [this archive](https://mega.nz/file/JRtQjShL#Wgqzbf-ycGLUWpWnj2iYQa-VgM9lXzNNJgPiRj5axWc) to the root of your SD card. Merge if prompted.
Since yuzu is currently [unable to run this game](https://yuzu-emu.org/game/laytons-mystery-journey-katrielle-and-the-millionaires-conspiracy-deluxe-edition/), you will also need to have an exploitable device with [Atmosphère](https://github.com/Atmosphere-NX/Atmosphere/releases/latest) installed.
Be aware that the Japanese and English character names are very different, which will not be fixed by simply swapping the audio files.
Three videos are different between the Japanese and European XCI scene releases ([all images](https://mega.nz/file/xA0g2K4D#OWuJXtHq_xfKwRpV0mHXQYJ50iOQxYs7xHTTrToGn8M)):
jpn|eur|changes
---|---|---
`mov/[jp]/m004.mp4`|`mov/[jp]/m004.mp4`|`Sherlo Ckholmes` -> `Sherl O.C. Kholmes` ([screenshot](https://slow.pics/c/Zdz3dm3b))
`mov/m014.mp4`|`mov/[jp]/m014.mp4`|jpn: movie ends on a freeze frame before the kiss, eur: the latter is shown and a wide shot was added ([screenshots](https://slow.pics/c/eLowQXay))
`mov/[jp]/m026.mp4`|`mov/[jp]/m026.mp4`|`Lilia` -> `Felicity` ([screenshots](https://slow.pics/c/cLa1z6ik))
The only files changed in update v1.0.1 (v65536) are the main executable, its NPDM and `version.txt`.
\>r5413+v031
\>wifi_dbg/※このフォルダはロムに含めない (*Do not include this folder in ROM)
lol
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SomaHeir
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