I think you need a plugin with a PRE hook on build_title_linked. Then you can copy the build_title_linked sub into the global and put in a
GT::Plugins->action ( STOP );
to use this sub instead of the original. Then you can modify it to get the output you need (may not be that straightforward to do this bit!)
GT::Plugins->action ( STOP );
to use this sub instead of the original. Then you can modify it to get the output you need (may not be that straightforward to do this bit!)