That’s shitty. I’m sorry your parents (both real and step) were such terrible people. Hopefully you did okay despite their best efforts.

Should be possible to make a compatibility layer. You can run android apps on PC now, according to constant banners on Play Store.

The biggest issue is hardware support. Mobile hardware still uses custom drivers for everything, so you wouldn’t be able to ramp up a new OS on existing hardware. You’d need to invest in making both a phone and an OS, and that’s a big risk considering only a small amount of turbo nerds will care.