There is a group called pantheon. I would give a fair warning that pantheon is not really targeted at a rolling system like Arch and as a result is often broken.
There is an unofficial repo for Unity but I am not sure how well maintained it is at this point.
Yes, that is the reason, I have the Elementary ISO for install, out of curiosity, but I am not sure if I care for yet another 'buntu based distro, so maybe if I can try de DE as standalone.
Anyway, I guess if they are good (Pantheon and Unity) they will be a thing later on.
That repo is one version of Unity behind the latest (7.6 > Ubuntu 22.10 versus 7.7 > Ubuntu 23.04). One update would do it as Unity doesn’t appear to do interim versions - it is in effect updated once every six months.
Ubuntu Unity is good, but it would be better if it were not Ubuntu