Perhaps you can position the mouse with btt first?
Tried that, but I don’t think btt has a concept of “text cursor”. I can only position the mouse cursor with absolute coordinates or relative to the window.
I don’t recall ever having such a request from anyone using the Accessibility features. 
I’m extrapolating from other apps. Not sure how much of an overlap there is between DTP users with accessibility needs and those who use WikiLinks. If you do have such a group you may want to ask. I imagine many have their mouse cursors set up to be controlled by keyboard, but opening links via keyboard regardless of mouse cursor position may still shave off some time from the process. 
The next release will add a menu item Go > To Link (default shortcut Cmd-Shift-Return) to open the link at the current text cursor position in plain/rich text and Markdown documents.
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