Hi Keith. Sorry but the answer to your question is effectively no.
HTML provides "image maps", which allow different areas of an image to be made clickable as links to different web pages. See for example this description.
However, there is no way to use these image maps on WikiTree. The necessary HTML tags <map> and <area> are not recommended here.
The only possible approach would be for you to set up an image map on a page on a different external website which you are able to edit, then link to it from your one-name study page.