identical device/vender id's

I'm looking to pass-though an LSI HBA (the 9207-8i) to a VM. I already have everything configured as far as IOMMU groups, VT-d, enabling IOMMU within Proxmox, etc. It's all ready to go except the fact that Proxmox grabs the HBA when the OS starts and I need it to remain free. The Proxmox...