I found a metalink note. How To Redirect a URL To A Custom Apex Application Page [ID 1343077.1] I found the note from your description of how to do this, One question, it says create this in your workspace schema. What is the workspace schema?
create or replace procedure myownapp as
grant execute on myownapp to apex_public_user;
EPG -> grant execute on myownapp to anonymous;
create public synonym myownapp for schema.myownapp;