Embedded resources in an interactive pdf

Hi, i'm creating an interactive pdf for a client in Indesign. The pages need to have buttons which open other pdfs. The final pdf will be used in places with no connectivity so I can't host or link to these pdfs, they need to somehow be embedded within the main pdf. I appreciate I can add these as pages within the main ID doc, but some have multiple pages themself so addign each page of these resoruces as individual pages will become a problem.

Is there a way I can create a button to open one of these pdf resources as an extra window in whatever pdf viewer they're being opened on? I tried this a few years ago by linking the files within the same folder as the main pdf, but when the folder containing them all was moved onto different platforms the button link was lost, so each user needed to re-add it in Acrobat, which became a problem.