There is one tool I remember doing which sucked. It was some long ungodly time of waiting to extract game data from LAN. I only managed to do it once cause I wanted to try New Super Mario bros U on the CEMU emulator and I did succeed, but after I couldn't figure out how to get the Luigi DLC to work I gave up.
(I did it this way cause I didn't have access to a SD card. Seriously I hope USB become more useful like the wii did with homebrew.)