The only advantage of this scenario what I see is
PCIe card with usb 2.0 with MorphOS and usb 3.0 with linux. Usable with Powermac DC, X5000 and maybe X1000.
But without MOS drivers for 3.0 it have very little value.
AmigaOS3: Amiga 1200
AmigaOS4: Micro A1-C, AmigaOne XE, Pegasos II, Sam440ep, Sam440ep-flex, AmigaOneX1000
MorphOS: Efika 5200b, Pegasos I, Pegasos II, Powerbook G4, Mac Mini, iMac G5, Powermac G5 Quad