Scratch that, they hid it really well in Windows 11. *sigh*
So, after installing the Mac keyboard layout (I had to use the msi directly, setup.exe gave me an error) go to Settings > Time & language > Language & region > English (United States)
> (… menu) > Language Options > Keyboards and make sure the Mac keyboard exists.
You can move English (United States) to the top of the keyboards list and use the keyboard switcher in the task bar or Windows Key + spacebar to switch to it.