Yes to the second question, and yes, with FBI inject. Use rxTools launcher to install FBI on sysNAND. To install the cias pack, I think you just put it in an updates folder, should come in one though.
Would it be possible to get a DS emulator for the 3DS? There are some games I'd like to play that simply just don't exist in stores, and wouldn't go well on a PC emu
It's not an N3DS exclusive, as there is a version included with the Amiibo Read/Write (which the N3DS would not need) and wouldn't a Region Free fix Language errors?