not certain if this is exactly what you want to do, but I use the insert weblink option to jump from one wiki to another within the same couse.
Simply copy the URL
of the page you want to jump to and create web link to it in the wiki you want to junp from. Then paste the url into the web link dialogue and select target: new window.
By selecting the target as new window you keep your original wiki open and open a new tab for the wiki you are jumping to. That way you can always return to your original wiki
Hope this helps