You can still get to your overview page by going to your user page and clicking "OVERVIEW". The user pages of people who don't have same-named wiki accounts default to their overview pages but I don't think there's a way to make yours do this, with the possible exception of deleting your wiki account. You can of course edit your wiki page to have whatever links you want on it.

(By the way, the mapping between LW accounts and LW wiki accounts is not updated in real time. It's maintained by a job that runs once a day or so.)