What if you use the CD-Sunrise extension? Copy your System 7.5 install to the Jaz disk, pop CD-Sunrise in it, and you should be able to read the Mac OS 9 CD.
Or, put CD-Sunrise on your main System 7.5 disk, insert the Mac OS 9 CD, and then copy it to a Jaz cartridge. (If you have spares, just leave one cartridge set up as a 9.0.4 or 9.1 installer. Since you'll have some extra room, just put whatever other software installers you want as well.
Or, put CD-Sunrise on your main System 7.5 disk, insert the Mac OS 9 CD, and then copy it to a Jaz cartridge. (If you have spares, just leave one cartridge set up as a 9.0.4 or 9.1 installer. Since you'll have some extra room, just put whatever other software installers you want as well.