[1123581321]

Put ChromeOS Flex on it. It’s a flavor of ChromeOS/Neverware meant for old PCs and Macs that can’t keep up with Windows and macOS. https://chromeenterprise.google/os/chromeosflex/

[lupire]

I want a Mac. I don't want a Mac and a Chromebook. But maybe someone else would use my old Mac as a Chromebook. Except there are zillions of cheap Chromebooks around already.

[1123581321]

In that case, you have either the opencore/hackintosh route or you can simply run on the last compatible OS.

There is a market for nicer-feeling Chromebooks, so ChromeOS Flex is a partial remedy for e-waste.