Thanks for the feedback. Yocto Kirkstone with ROS Humble is one of the combinations we are interested in supporting.
You do not need to use Gentoo to use superflore. I personally have been using it on Debian and Ubuntu machines. I published the steps I use to install superflore here: meta-ros-maintainer-notes/README.md at main · robwoolley/meta-ros-maintainer-notes (github.com)