There are a lot of 630 mm scale length classical guitars that have good tone and good projection. Plenty of players on the Delcamp forum have spoken highly of their 630 mm scale length classical guitars. I have also seen several players mention having 3/4 or 7/8 size guitars, including 3/4 to 7/8 scale length, that were happy with their instruments.
I owned a student grade Kenny Hill 630 mm classical guitar for awhile just a few years ago. It was a fine guitar, and I liked the shorter scale length. I still sometimes entertain thoughts of acquiring a concert level 630 mm nylon string guitar.
Of course, one can always just use a capo bar. I do that a lot too, on all of my 650 mm and 640 mm scale length guitars, especially the ones that have 24 reachable frets, including my 2018 640 mm scale length cocobolo Emerald X10 nylon string beauty.
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