Respect. Big respect. Those people are hardcore from scratch hackers, and their wiki is amazing: wiki.archlinux.org/
But can you build the ISO full from source: Linux distribution buildable from source
This section describes our attempts at compiling the Linux kernel for Ubuntu so as to use the exact patches and build configuration as used for a given Ubuntu release. The same toolchain would also be ideal, but perhaps this would require a Linux distribution buildable from source.
canonical-kteam-docs.readthedocs-hosted.com/en/public/how-to/build-kernel.html seems promising it says that for Ubuntu 24.04 and above you should do the following which was tested on Ubuntu 24.10:
sudo cp /etc/apt/sources.list /etc/apt/sources.list~
sudo sed -Ei 's/^# deb-src /deb-src /' /etc/apt/sources.list
sudo apt-get update
sudo apt build-dep -y linux linux-image-unsigned-$(uname -r)
sudo apt install -y fakeroot llvm libncurses-dev dwarves
apt source linux-image-unsigned-$(uname -r)
~/tmp/ubuntu/linux-6.11.0
cd linux-6.11.0
chmod a+x debian/rules
chmod a+x debian/scripts/*
chmod a+x debian/scripts/misc/*
fakeroot debian/rules clean
fakeroot debian/rules binaryThe build is extremely slow compared to a build of a more embedded and specifically targeted minimal kernel, and took about 2 hours on P14s. Their philosophy is likely to enable as many drivers as possible so that a single download will work for everyone. Which makes sense, fair enough. It would be cute though if there was a smarter way. Oh well.
linux-6.11.0/debian/build/build-genericThe greatest advantage of it being that it has the likely largest desktop user base, and therefore the highest likelihood that your problems are solved on Ask Ubuntu, and goes together with Ciro's philosophy that "people should do everything in the same way to factor stuff out", especially the open source losers.
Ciro considers that the killer flaw of Ubuntu, and most desktop distros of 2020, is that no one under the Sun knows how to build them fully from source: Linux distribution buildable from source. This is why Ciro based the Linux Kernel Module Cheat on Buildroot, see also: Linux distribution buildable from source.