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You can do all that minus the offline Xcode project part, which you need to sign in to download I believe.

You still need the 99 USD thing, need to get a personal profile in XCode and the certificate only lets you use the app for the week.

It's been a while since I last tried it, please correct me where I'm wrong if anything changed.

One week signing is free with an Apple ID. It's the way tools such as AltStore function.