Have you considered a fixed release in combination with rolling applications (i. e. Flatpak, Snap)?
If you choose Fedora (preferably one of the atomic variants, like Silverblue), you would also get a rolling kernel and rolling KDE Plasma desktop, so overall the experience can be quite close to a rolling release distribution if you install the desktop applications via Flatpak.
Ubuntu “interim” (non-LTS) releases are usually also fairly current and could be a good choice if you don’t mind Snap. There’s also the option of following the Ubuntu “devel” branch, which always refers to the current pre-release version of Ubuntu (e. g. 24.04 at the moment) and is rolling.
Just wanted to give you a different direction to think about. ;)