[vfio-users] vfio-pci late loading, built-in or initramfs

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I have recently installed an AMD card for my host system, and my vm
guest is also using an AMD card. On the host, I am using radeon driver
but would like to prevent the guest getting radeon loaded. With
pci-stub, with it built-in to the kernel, it would always grab pci
devices before any other driver got the chance. However, with vfio-pci
it seems to be loaded much later in the boot process, so radeon gets
both cards before vfio-pci can bind it. As a result, I have tried
building vfio and vfio-pci as modules and then including them in a
Dracut-created initramfs as detailed at
https://vfio.blogspot.com/2015/05/vfio-gpu-how-to-series-part-3-host.html.
Even doing this, vfio-pci still gets loaded as late as it was built-in
to the kernel, and so it does not get loaded before radeon (which is
built-in).

Is there a way to get vfio-pci loaded earlier? Do I need to just build
radeon as module to hope it gets loaded later also?

Thanks,
MB