Go directly to user's previous submission?

I have an application in which it makes sense for a user to return to his or her previous (single) submission and edit it. It's for a sort of glorified task list; many users are doing the same tasks and recording their progress.

I'd like a user to be able to get to the previous submission, without having to navigate there via You have already submitted this form. View your previous submissions. and then clicking Edit. Is there a way (or an addon module) to have the webform page go directly to the previous submission? In addition the "Edit" page uses the admin theme, and I'd rather use my site's regular theme so that the edit page appears similar to the initial submission page. Could I switch the theme? Thanks.