I've always wanted to try a 10-string classical - but they are generally very expensive and left-handed instruments would probably need to be custom-made. I then came across Cathedral Guitars in Texas - a multistring guitar specialist. They do a range of relatively affordable instruments made in China. They don't have left-handed versions but assured me that they had carried out left-handed conversions with no problem - even tackling the fretboard, which was cut away for a right hander on the upper frets. The conversion was quick, relatively cheap and included the installation of Fishman electronics and a soundport. A photo is shown below
Solid spruce top, laminated rosewood back and sides and an ebony fretboard. Both tone and playability are excellent and the conversion has been done really well - the only sign of the right-handed origin are the original fretboard side markers at the 7th and 9th frets. Baroque Tuning - standard guitar first six strings, then descending DCBA. It was surprisingly easy to get used to the wide neck.
Stephen at Cathedral was exemplary in his help and communication. Their website has a lot of information too.
https://www.cathedralguitar.com/
Comments
Some say this is easier but I haven't tried it or attempted to get my head around it. Obviously, different strings are required for the bottom four.
I'm currently using it as, I suppose, a harp guitar with four open sub-bass strings.
https://www.youtube.com/watch?v=eVabz8LneI4
I have no idea how to approach a beast like that - feel free to post a video …