Well, the reason it's not working in FSPort is actually rather obvious... so obvious most people miss it. The 'osiris-shp.tbl' you have is setup to change the 'GVB Osiris' model to the hi-poly one.
Now that I've pointed that out, who knows the answer? Anyone? Oddgrim? No? OK.
You need to open your 'osiris-shp.tbl' that you have in FSPort-Mediavps/Data (or wherever you put it) and find the line '$Name: GVB Osiris'... change that to '$Name: PVB Osiris'.. that should do it.