I like all your enthusiasm when it comes to texture upscaling, but tell me something, what kind of benefit could this method bring us?
The approximate weight of an ISO is between 3-5GB, if you add upscaled textures to that, then every person here who upscales textures would need a cloud storage of massive size, specially those who make separated packs for Android. To that you must add that each person who wants to try between two packs, must download two ISOs, which is not optimal.
Then you have the fact that the PCSX2 devs avoid talking about texture upscaling and ISO download sites because that would be encouraging piracy, and as devs of an emulator they can't risk their project for some PNGs. Things would get worse if upscaled texture packs required you to download an ISO for the game.
To that you must add that distribute an ISO would mean getting the warez role on the PCSX2 discord, and that means that no support from the devs will be given to you.
So I ask again, what kind of benefit could this method bring us?