1. A 64-bit Windows 2000 continuation project that retains the UI but applies every security patches since then. Is it even possible? Would some security patches need a new kernel? I'm not technically good enough to answer.
(Or, a completely debloated Windows 10 -- by saying debloated I meant a complete removal of telemtries, ads, shops, whatever, and I do not know why I need .Net at all if I don't need the applications)
2. Modern code IDEs based on the same idea, maybe a better Visual Studio but written in native C++, just like a continuation of Visual Studio 6 without getting into .Net.
P.S. my view of .Net is uneducated and biased. I think they slow down the OS and Apps but I have zero clue, so I'm probably wrong. Maybe the .Net code in Visual Studio is as efficient as the C++ code but it's just the product is not modular enough so we have those 10 seconds start up and other slowdown issues.