I've wanted to follow the development of Plasma 6, and offer to help in any way I can with testing and validation, so the obvious thing to do was to temporarily change my laptop's repository to unstable, right? Too late, I found out that having done that, I could no longer change back to shannon - it's a one-way process. Not wanting to have my daily-driver laptop on unstable permanently, I decided to consider it a lesson well learned, reinstall Solus Plasma on the machine and rebuild it (including my collection of Solus VMs).
With my laptop fully restored, I remembered that I could easily clone a VirtualBox VM in about a minute. So I cloned my Solus 4.5 Plasma VM and renamed the clone to Solus Plasma 4.5 Unstable. So, now I have a fully usable computer for that special purpose. I'm posting this message from it now.
This new VM has everything it needs for its intended purpose, and nothing it doesn't need. It can access my NAS, it can hibernate, and its UI is set up to make accessing Solus' sites easy. The one issue I ran into was that Vivaldi would not start, no matter how I tried to lauch it. Obviously that was a cause for concern. But on a hunch, I installed vivaldi-snapshot, sync'd it, and that works fine.
I thought I'd mention this here, in case there are others in the forum who'd like to follow along with the Plasma 6 adventure but don't want to permanently change their daily-drivers. If you create a VM to use for the purpose - or clone an existing one and modify it accordingly - you can have the best of both worlds without making permanent changes to your computer.