Once again the importance of developers on any operating system. Not only are they responsible for developing the best applications, but they also modify the devices to achieve goals that we would never have imagined. It is not easy for them to release this type of manipulation, but the latest feat on the smartwatch of the bitten apple allows us to run a simulation of iOS 4 on the Apple Watch.
The developer who has accomplished this feat is called Billy ellis and, as you can see in the video, your Apple Watch is capable of running a simulation of iOS 4. In the video we can basically the Springboard of what an iPhone 4 would be, with the famous skeumorphism that died with the arrival of iOS 7, and its settings. Logically, the iOS 4 simulator does not fill the entire screen, but it is seen with the same format that it would have on the iPhone 4 and, at the top, we see the name of the system and the current time.
https://twitter.com/bellis1000/status/634831056563236864
Ellis, it's important to mention that he is only 14 years old, has called his tweak ios-sim and it joins other modifications such as those achieved by Hamza Sood and other developers, such as Saurik y Cía, although in the case of the French it was more his company than he himself who managed to run native applications on the Apple Watch, something that, in theory, it was not possible yet.
The young developer's Apple Watch is using one of the WatchOS 2 betas, which brings as the main novelty that it can run native applications. Actually, your proposal does not seem that it will be too useful since the Apple Watch will soon be able to run native applications much better than what this simulation of iOS 4 could offer us, but it is a demonstration of what can be done with the Apple Watch in a future and, if the smartwatch can be jailbroken, we could use really interesting modifications.
What you see is an app that simulates the interface of iOS 4, not iOS 4. You're welcome.