[A] No, nobody has released a publicly available launcher.dat which works with the web exploit to launch an emulated NAND from the SD card.
You need to buy a gateway card, or downgrade to 4.5 and lose your saves, as the mt launcher used the ds profile exploit.
Hopefully someone will release one. I don't want to blow like £60 on a card that probably costs a lot less to make, neither can I afford it. I'd rather buy some hacking gear with that cash. *Cough* WiFi Pineapple.