Agreed, it will probably be much easier to rename than have 2 specific forums/categories. And as @fennec says a lot of topics are related to both anyway.
I’m a member of a Honda motorcycle forum and there are 2 models of bike. When you create a post you are required to pick ‘Model A’, ‘Model B’ or ‘Both’ so people know which bike it is for. Maybe could do the same here if this forum allows it?
Tagging sounds very promising. The ‘Pimax 8K’ forum/category (as it is now) is about to get very busy, very soon what with all the Kickstarter backers receiving their headsets and then pre-orders and retail in several weeks.
I’m sure some of those people will be confused where the 5K forum is…