Has anyone figured out a workaround on having different background images depending on the page you go?

I haven't tried this.

But you could put all the content in the new section in 1 container that you make full screen and then you change the background of that container.

Hope you understand what I mean 😅

Set the page to a wide box.
Add containers for each arch in full width.
Add content to each container.
Add different backgrounds to each container.
Add section breakers to create “pages”.

Possible workaround: put them on subdomains and thus different cards.