There is also a link to a custom OS9 only restore CD on that page.
I think its the one I used with success...
So, I just finished using that "Custom OS9 Restore" to get the OS loaded, in a sort of roundabout way. (I found it right after my previous post.)
Said "restore" is simply the contents of the hidden disk image that's on the DVD restore images. To avoid wasting another CD-R blank I formatted a USB key with an APM partition map (and OS 9 drivers) HFS Extended and, using the MacBook, dragged the contents of that image onto the USB key. (Along with the "Utilities" folder from the 667-800 CD.) Unfortunately the resulting key wasn't bootable because just opening an OS 9 system folder in the finder under Mojave won't properly bless it (it does look like I *might* have been able to do it via the command line.. maybe, probably not?), but I was able to boot the Ti from the "wrong" disk and drag the USB contents to the hard drive, where it did indeed result in a bootable volume. (It even fires up that annoying setup assistant on the first boot.)
Worth noting, perhaps, is that after touching the USB key under OS 9 it became blessed and is also bootable. It boots slower than lukewarm molasses, given the machine only has USB 1.1, but it does work. I wonder if it would be worth it to anyone to copy these files onto an as-small-as-will-fit USB key partition, make it bootable, and then image that for future use.