> A more challenging project I did later (which I probably deserve some derision for not documenting and sharing) is "How to develop, sign, and upload iOS apps entirely from debian linux, entirely with F/OSS, no VM, no Xcode, just good ol' emacs and cmake".

Please write this blog post. I've no interest in running Mac OS for any reason other than to test software in it and use it as a developer account for cross-platform apps. This would be a huge boon to people like me.