it seems to me someone should write a nifi library for the pc... if only there was good documentation of nifi... hmm I will look on the ds homebrew forums
The problem is that even if you had such a library you'd still need a compatible device. That means custom drivers, which are specific to a make and model of wireless hardware. It's just not too feasible.
The only reason I say that is because if someone has a flashcard, putting a bunch of development into some kind of nifi-enabled homebrew is a waste of time. The tools are already there for a person with a flashcard to edit their saves; and save editing will always trump these network hacks. It's nothing personal.