Trying to replace or modify Navigation Buttons

I'm trying to replace/modify the nav buttons that appear directly below the form footer. I have a form that uses two sub forms, both dependant on the form before it (EI. Parent-table, Sub-table of parent, Sub-table of Sub). All three of these forms need some kind of navigation in order to get the results we're looking for out of them. Idealy, I could use a drop down box because the information in the content is static and there will be no new entries, just reference numbers.

Any ideas on how to replace those nav buttons with something else or how to modify them in some way.

Also, if there is any way to make them appear just before the FormHeader, that would be great... yeah...