I did look into the Vita patch, they use a modified dlc to load modified game files.
the uncensor mod only changes ef_mosaic00.btx & ef_mosaic02.btx, but the lewd mod changes almost all underwear textures, over 300 changed files.
In the switch version we can't do that, because the dlc is just a unlocker, it doesn't contain files, but this is only a minor problem, we can just repack the armHD_nx.cpk, but this decreases the sd card space by 2 GB.
The bigger problem are the texture files itself, they still have *.btx as extension, but they have a much higher resolution and a different file format.
Vita uses 256x256 GXT (DXT texture compression), Switch uses 512x512 SHTXP4 (RGB raw colors)
someone needs to write a new converter and someone needs to create higher res textures.