I would create another route and then just call submitform('thatRoute'); and then have that route just call the default function. It is kinda a roundabout way to do it, but it is the best way to keep all the right values. Hopefully this makes sense.
Thanks for the suggestion, Trey. What I ended up doing is capturing the form HTML and setting it to a variable on page load. Then, when the 'Go Back' button is clicked in the modal, I set the form HTML to the variable. This approach seems to work well