I prefer to use E:\, in case of incompatible fonts to re-change fonts
1. Copy set of your fonts to E:\resource\fonts (same as fonts naming in Z:)
2. Edit C:/private/10003a16/lfonts/*.ltt (backup first), Edit with text editor
change Z:\resource\fonts to E:\resource\fonts, 2 lines per file.
3. restart, enjoy your new fonts loaded from E:
4. want to re-change fonts, just replace set of fonts on E:\resource\fonts with new fonts, use Mass Storage mode