Why not just build a complete Linux replacement, since the kernel is also C? I'm not really that concerned about C so I won't be able to fund the efforts, but

Why not just build a complete Linux replacement, since the kernel is also C? I'm not really that concerned about C so I won't be able to fund the efforts, but I'm sure once you have a bootable operating system that works with existing software that people will be willing to donate to you on Patreon.