Only one way to install the modified IPA file that is using Impactor for Non-Jailbreak devices.
but impactor is for resigning the IPA, what if we restore everything from the original signed IPA and make a copy of it but only this time containing the modified content instead of the original content in the archive? like a byte by byte copy, if this works the downfall of it will be that every user that wants to use the mod has to go through all the process of unpacking, replacing and repacking by themselves
Sorry, I dont understand what you are trying to say. I've been modifying many ipa files and I understand that you also want to make a mod for an ios game or application. You just need to open the ipa file with the 7zip software and replace the files inside with the edited files. Then you can use Impactor to install for non-jb devices.