You could try to use yaboot-installer as a starting point or even make
it possible to install yaboot and quick with the same installer
component. Probably it's not too much code, but it needs to be done and
tested.
As I don't know quik, I don't know if it's simply a matter of calling
quik instead of mkofboot.
Yes, pretty much. quik installs itself in a boot block instead of
needing a separate partition. It uses /etc/quik.conf instead of
/etc/yaboot.conf, and you call it with `quik` rather than `mkofboot`.
The scripts are still there in boot-floppies; the piece we haven't
mentioned is using ofpath to figure out how to set the nvram
parameters. What's there works for most people.