Actually, the Steyr SPP was never featured in The International, as they are no longer built. In 2001 Steyr sold the production rights to Brugger & Thomet of Switzerland. They've since updated the old platform with a new side-folding stock, picatinny rail mounts, and a new trigger safety, and renamed it the MP9, instead of the TMP, and, like Steyr also did, B&T developed the semi-auto pistol version as well, naming that the TP9... *exhales*
So, that's the actual story, but that's coming from a guy with far too much time on his hands and has next to no imagination when it comes to firearms-based histories and nomenclature, but yes, for someone more creative than myself it could make a nice TP9/SPP. I've actually used this particular weapon, and I thoroughly enjoyed it. Great work on this weapon, and best of luck on that SPP, Creasy.