Maybe setting up a VPN and the proper routing between networks might work. But remember they will only be able to load games as fast as your internet connection is. If my buddy and I did it we'd be getting about 1.5 Mb a second (our internet upload speed). Games would take forever to load because you would need to divide the 1.5Mb by 8 to get the MB/sec speed (187.5 KB as sec or 1/8th the speed of USB on the PS2).
PS3 Slim 320GB
PS2 v11 exploit w/300GB Maxtor
PS2 v10 exploit w/80GB Samsung - Network Games
PS2 v10 exploit w/60GB Samsung - Network Games
PSP 1001 3.52M33 w/10GB total storage
NDS DSReal 4GB