Unfortunately there are no alternatives. All methods of changing the C-Gear require some form of external hardware. In fact, the GTS is the only online feature in the game that we can hack. Everything else has SSL encryption, which is equivalent to the security of online banking sites. The Global Link protocol is very similar to the Mystery Gift protocol that I analyzed over a year ago: http://pokecheats.net/forum/showthre...tocol-analysis
If anyone is willing to buy a flashcart or some other hardware, then I'd be happy to help you set it up.