In Sharepoint (2010) wiki pages it is easy enough to add a hyperlink, but how can one add a hyperlink anchor without editing the messy html?
The wiki editor could make this easier :-)
This method works for me...
I have no idea if this will work in your case. Step 2 is weird. But it's the only way that I can invoke the "link tools" ribbon. Too bad this isn't part of the Link options from the get go.
[[EDIT: I didn't notice this before but SharePoint inserts the anchor/id AND a href link and there's nothing you can do about it except edit the HTML so my answer isn't much of a solution, unfortuntately.]]