Importing =

Hello! I am going to be importing a >=9.2 Japanese n3ds with Gateway Menu pre-installed through DS Profile. I have tried thinking of a way of installing Ninjhax without buying a 3ds Flashcard or a Japanese Cubic Ninja copy (I already have an American copy) and this is what I came up with. Since I am new to this I need some verification on whether or not this would work.
1. Boot into the Gateway Menu through DS Profile(?)
2. Launch RXTools MSET Installer through a DS Flash Card
3. Launch...

Importing =<9.2J n3ds w/ Gateway Menu preinstalled. Need help!