Reassembling diced sprites

[worn violet]

Hello! I'm trying to rip character portraits from a Switch visual novel called Mistonia's Hope: The Lost Delight. However, it seems that this game uses diced sprites; more specifically, I believe they used Elringus' sprite dicing tool. I haven't found any tools online that can reassemble the sprites, however.

I'm using AssetStudioModGUI to see the contents of the files. In each file, along with the atlas texture, there are several Sprite type files that cannot be previewed or exported. I've attached a screenshot showing the error. There is also a single Monobehaviour file, but it seems to just list the path IDs of the aforementioned sprites.

I've attached a couple of sample files to this post (and one of the atlas textures). I'd appreciate any help at all, no matter how small, to figure out how to reassemble these sprites. Thank you in advance to anyone kind enough to lend a hand!

[worn violet]

Update:
I've figured out how to reassemble these sprites in the Unity editor. However, I have no clue if it's possible to export Sprite assets as PNGs from within the editor. If anyone knows whether it's possible, I'd greatly appreciate the help. Otherwise, I'll have to figure out a different method...

[zealous fiber]

i reassemble sprites using libresprite

it is a version of asesprite back when it was open source

it is soooo goood for 2d games (that are sprite based)

and creating your own too!!

but this is a very high quality image, i dont know how that will be

(because the program lets you edit sprite made using tiles