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I have two questions here:
1. Why not run ClearOS directly on the hardware?
2. Does your board has pci passthrough support?
The latter is quiet rare, although it became more common on recent hardware. I bought a dedicated server mainboard in order to use pci passthrough of a Fritzcard Fax PCI to a windows vm.
Check here: http://wiki.xen.org/wiki/Xen_PCI_Passthrough#How_can_I_tell_if_I_have_IOMMU_.2F_VT-D_support.3F
The above link only tells half of the truth, I needed to pass a kernel command in grub.conf as well. Although I'd expect that to be set on a XenServer. -