What is the simplest way to get a rawhide i686 VM?
I think that's no longer possible, as it's been many years since Fedora stopped shipping i686 kernels. https://fedoraproject.org/wiki/Changes/Stop_Building_i686_Kernels
I guess you could try creating a VM with some other distro, like Debian, and running a Rawhide container in it?
A.FI.