Is it possible to have multuiple NNIDs and switch between the two whenever you want?
Or would it be easier to create a second emunand and switch those?
Or would it be easier to create a second emunand and switch those?
Nope. Backup and restore nnidsave.bin files.Only way to have multiple NNID's on a 3DS console is to have multiple emuNANDs. It doesn't work the same way the Wii U does.