OK, let me weigh in here and try to clear up a few things.
A) Sid is not exactly stable enough, it is after all, Debian’s Unstable branch.
B) We already have a rolling option in our Debian editions, you only need to enable the testing repositories.
If you’d like more of a, from one stable release to another, style update , you can try this:
C) Once I have a chance to work out all the details, I will be creating a tutorial on how to perform an in place switch from NRR to upstream Manjaro KDE. Besides the obvious themeing, there are many other differences, from grub defaults, and default systemd init services, to default groups, and settings. There are also some custom application package that will need to be looked at, things like gmusicbrowser-filterfun, web-menu-entries, and some plasma custom kcm’s and plasma applets, etc. that either don’t exist upstream, or that were pulled from the AUR and/or upstream arch (steam). This could take a bit of time, as I want to make the switch is as quick, and simple a process as possible.