KDE is an international technology team creating user-friendly free and open source software for desktop and portable computing. KDE's software runs on GNU/Linux, BSD and other operating systems, including Windows.
I have plasma 5.27 built and I can switch between the two with sdm, or replace my current session with the newly built one. Unless there's something strange about the new version, dependance conflicts, etc, it should work the same.
The other persons comment links to the method of doing this
This might not be exactly what you're looking for, but for things like this I like to keep a VM that's as close to my system as I can get it, and then if I want to run a weird experiment that might break everything I just run it on that and if it all goes wrong I can just nuke the VM with no harm done. Also looking at the blog that the other person here linked to, it seems like the link for testing it says to run KDE Neon unstable, so maybe you could just run that in a VM with the tweaks they mentioned?