That will get confusing, for example, sometimes desktop screen 9 will be swipe bottom right and other times swipe up, and will keep changing depending on what screen you are viewing. This will happen with all screens. And would require remembering a pattern if you want to avoid swiping to the wrong screen.

I think rather than remembering patterns, your original concept is better and far less confusing.

So just assign a specific direction to a specific desktop screen, e.g. swipe top left will always take you to 1st desktop, swipe up will always take you to 2nd desktop, swipe top right to always go to 3rd desktop screen and swipe left to always go 4th desktop screen and swipe right to always go to 5th screen etc, regardless of which screen you are currently on.

It will look something like this:

123
4 5
678

That way is much more simple and the desktop screens will not change direction ever. This will work perfectly for 8 desktop screens as there are 8 directions to swipe in and is an easy feature to use and easy to learn/remember.

For the 9th screen just have a double tap feature. So double tapping on any desktop screen always takes you to the 9th desktop screen.

Simple enough