Formativ is suited to this kind of simple workflow. Formativ 1.5, the current release, could be used to build this workflow. If you have development resources in-house familiar with VB development you could probably build this yourself using the example applets and Developers Guide as a starting point. Alternatively, you could contract the development work. If this option interests you, write to email@example.com.
Formativ 1.6, due for release within the next five weeks, makes it even easier to build this kind of workflow in a more integrated way. Depending on the size of your organization, you may be interested in beta testing 1.6 with the simple workflow you describe. Send an email to firstname.lastname@example.org if you might be interested in pursuing this option.