Looking for a way to add a back button to the Response Summary when it's separated in survey flow.

Hello,
I have a survey where I display a Response Summary page at the end, but before users submit their responses. We do this so that they can review their responses and go back as needed to make corrections.
Recently, I added a Table of Contents element and nested most of my blocks in it. I then realized that the previous button had disappeared on the Response Summary page. It turns out that happened because the End of Survey element, which includes the response summary, cannot be nested within the Table of Contents element. And, here's the part I didn't know, the back button will not show between blocks that have any survey flow element between them.
I am hoping that someone can find a way, through custom code or otherwise, of adding back the button. If it cannot be done back to the previous page (which would be one nested in the ToC element), perhaps there would be a way to include a link on the Response Summary back to a block that exists before the ToC in my survey flow (i.e., and earlier block that isn't nested in the ToC). Or, maybe there is a way to link to the Table of Contents page (i.e., Section Links).
Thank you!