There's a lot of info on the website about the challenges. There aren't many people working on it, so any help would be appreciated.
https://www.emaculation.com/doku.php/pearpc
"PearPC emulates a PPC Macintosh inside of Windows and Linux. It emulates a machine capable of running OS X versions up 10.1 to 10.4 (Tiger). PearPC does not emulate a Machine capable of running OS X 10.5 (Leopard) or greater. The emulated machine can also run Darwin and Linux."
See also https://github.com/sebastianbiallas/pearpc and http://www.windowsdevcenter.com/pub/a/windows/2005/01/18/Pea... .
What macOS-exclusive apps would be worth running in your opinion? The only one that I use is Photos, and maybe Pixelmator. So it'd probably be quicker just to write completely new software, which is what seems to happen.
Also, Apple has a nasty habit of breaking things between macOS versions and messing with APIs. Maintaining a compat layer would be horrible.
So far there are GNUStep and Darling but they are not ready for prime time.
You can buy an old MacBook for $99 That can run an old MacOSX on it like 10.7 or under but it would only be a Core 2 Duo, but would use Boot camp to run Linux.
However, I failed to find any Mac applications that were sufficiently compelling.
So I ended up deleting the OS X disk image.