Install App Mods on iOS 16

I need a clear, step-by-step method for adding an app mod installer to my iPhone running iOS 16 (or any later release). The device has never been jailbroken and I would like to keep it that way, so the solution must rely on non-jailbreak techniques such as AltStore, TrollStore, TestFlight, enterprise certificates, or any other approach that works reliably under the latest iOS security policies.

What I expect from you:
• A concise written guide that covers every step from preparation to successful installation, including links to any required tools or provisioning files.
• Screenshots or a short screen-capture video to illustrate the critical steps.
• Tips for troubleshooting common errors—certificate revocation, app crashing, or failed sideloads—specific to iOS 16+.
• Confirmation that the method will survive standard iOS updates or, if not, instructions for quickly restoring the mod installer afterward.

If you have first-hand experience sideloading or maintaining mod installers on non-jailbroken devices, your insight will be invaluable.