sign a .ipa to a new Apple ID

hello all, so I have a .ipa file and I have done the necessary steps to open it up and view the contents which include: replacing .ipa with .zip, unzipping it, and opening up the file it has created. inside the file I can see the app icon/artwork called "iTunesArtwork" then there's iTunesMetadata.plist and a Payload folder. hopefully this sounds familiar and you have an idea where I am?

So I understand I can open up the iTunesMetadata.plist in Xcode and it gives me a Bunch of info about the app under "Root" such as the app id, version, etc. Now there is an option which says "appleID" and it has an Apple ID email address in it. for this example I I'll call it Johnappleseed@icloud.com. So my question is can I remove this "Johnappleseed@icloud.com" and replace it with my own AppleID AND save that change, convert the whole file ("iTunesArtwork" "iTunesMetadata.plist" and the Payload folder) back into .ipa format AND then install that .ipa to an iPhone. subsequently am I able to make other changes like change "Softwareiconneedsshine" from "NO" to "YES" and the. install the .ipa to my iphone.

in simpler terms, i am wanting to sign the app to my apple id for more than 7 days if possible without a developer account and make changes ASWELL as still being able to install that modified .ipa onto my iPhone. if anyone has any ideas how to do this or am I doing things wrong?

thank you in advance :)