TeunisRooseboom Heya Teunis, finding a left handed 3/4 nylon stringer won't be easy...I don't recall ever seeing one!
Probably because it is easy to change a nylon string righty to lefty - all you'll need to change is the nut for one intended for lefties. (You'll possibly have to get a nut made or DIY if you are handy). You might be able to just to flip if around, though some have a shape that won't really work as easy as that - worth a try though.
You'll also will need to flip the saddle around, that shouldn't need any fettling to get right (there are exceptions though)
Raru have a few 3/4 size guitars listed - much of a muchness. I'd get the tanglewood over a sanchez/valencia - the tuners are slightly better.
Guitar stores (and luthiers) will be able to help too - if you are in Cpt, I can recommend the Gear Junkie - they've done bunch of lefty swops.