I think plasma 6 is independent with kernel, at least I do not customize plasma. ok stop here, It is a wrong to post here.
I think the topic has drifted off topic as it initially was kde related - now it is kernel - I suggest staying on topic.
The reason why the arch kernels is not in Manjaro official repo is a larger selection of kernels and because of that kernels are compiled at different point in time and libraries need to match.
You can do exactly what you want to do - you are the system administrator of the system.
If you choose to do - if something fails - don’t ask us why it doesn’t work - because in such case we have no idea.
When compiling your own stuff - it is recommended to move to the edge of Manjaro (unstable branch)
If you want to compile your kernel there is a topic explaining how - just search the forum compile kernel
I recommend adding -mtune=native to your ~/.makepkg.conf - if you don’t have it copy the /etc/makepkg.conf to ~/.makepkg.conf and edit that file
You can compile the zen kernel easily
sudo pacman -Syu base-devel
git clone https://gitlab.archlinux.org/archlinux/packaging/packages/linux-zen
cd linux-zen
makepkg -i
That’s really all there is to it…
with plasma 6, we can remove all kf5 group
pacman -Qs | grep kf5 # or pacman -Qg | grep ^kf5
...
local/kdesu5 5.115.0-1 (kf5)
local/krunner5 5.115.0-1 (kf5)
...
krunner is already gone for testing and unstable branch.
I agree, this package is obsolete, at least for testing and unstable.
Well … sorta … not really …
For example manjaro-settings-manager still relies on kauth5 and kcoreaddons5 and kitemodels5.
So for most users removing kf5 wholesale is not a viable option as of now.
They may use something like
sudo pacman -Ru kf5
which will selectively remove what it can.