Hey Kyle.
As you have found, the default database functionality is limited. You can only submit a database type form to one table.
With webservices and SQL express you get much greater flexibility.
You could possibly use code to do this second submit.
I would suggest you use Access.
If you have the data in tables already I would run a process to move the data to another set of tables once it is through the process.
This is probably the easiest. I would recommend moving from Access to SQL express for performance and then you can have stored procedures executed by an Agent.