The legal route would to be to provide an installer that downloads e iOS frameworks from Apple, so you aren't redistributing anything. However, it would still b

The legal route would to be to provide an installer that downloads e iOS frameworks from Apple, so you aren't redistributing anything. However, it would still be quite a bit of work: iOS has a not-insignificant layer of drivers in the not-yet-recreated IOKit kernel framework (although some are open source), and likely many other low-level layers that would need to be recreated. However, it's certainly possible, but as 'mparlane says, it would be a lot of (difficult) work.