Move window to other space by pushing; multiple monitors
The workarounds are fairly well described on the page you linked...


Disable 'Displays have separate Spaces' in System Preferences > Mission Control.
This will re-enable the drag action, if you hit the extreme left or right of the screen pair.
Grab the title bar &amp; use the appropriate shortcut key  Ctrl ⌃    [Number]  - though this needs setting up in System Preferences > Keyboard > Mission Control. Commands are added with each Space, but not activated by default.
You can also use  Ctrl ⌃   ←  or  Ctrl ⌃   →