Is this possible?

I don't think so,
but what I've done just recently is I've installed Ubuntu on MacAir.
Just make a new partition, unallocated - free space, (I've used around 28GB for it).
Copy Ubuntu installation files onto USB (may need a program to make the bootable USB).
Restart the computer having USB connected and holding ALT, select Ubuntu installation.
In the installation process select "Other" and choose Ubuntu to be installed on the free space partition.
Everytime you restart the computer, in order to boot to Ubuntu hold Alt key, and select "Windows" lol. And it works!