[Solved] What's the best way to hide the preinstalled software you don't need from the KDE menu?

I like the Slackware approach of installing the kitchen sink by default. Disk space is cheap.
But I find that the cluttering of the menus in KDE is a bit annoying. I use search to start my applications, and a lot of the time I have to type almost the full program name to get to the app I actually use.
What's the easiest way to hide a large number of programs from the menus, which is also easily reversible?

My first idea was renaming the .desktop files in /usr/share/applications to .hidden
But they seem to be recreated automatically.

Another idea was to copy .desktop files from /usr/share/applications to ~/.local/share/applications and then do:
printf "\nHidden=True" | tee -a ~/.local/share/applications/*.desktop

But I tried to add this manually with one test file and it didn't seem to have any effect.
Is there a config file somewhere that specifies in which paths .desktop files are parsed?

Or is there a better way?

Thanks a lot, and happy slacking!

[Solved] Slackware comes with kmenuedit which can be accessed by right-clicking the app menu.