Well that would be fine. Some folks use sawhorses for roosts, for example. So a fully removable, detachable roost set up like this shape should work (darker green indicates the supports which can't be seen from this camera angle):
View attachment 3975562
Fair enough, I wouldn't cut it either. If you have branches and maybe some wood scrap around, that's the most cost effective way to build this.
Chickens don't really think that way. More likely if they're all sharing the bar, it's because they've made enough peace to share, not because they're wanting to snuggle.