I just remembered one other thing that could solve your problem, but is again a hardware solution. Back in the day, Nintendo had released a special dongle that took the computer's connection and relayed it automatically as a WEP connection for use with the NDS and Wii. If you can find one of those (should go for about 6$ for a used one), it can make your life easy and it actually works with the PSP too (I have one myself and tested it).