Hey Actually in meantime, I found kind of a way to do at least find the pages I need to update.
Did not test yet if can update directly
So at first created a skuid page to view skuid pages, and did not find the XML. then realized that the field containing the XML is called Layout
So created a table, but so big that if laod more than 5 rows , it would hit an apex limit
So tried with dataloader, and was able to CRTL +F to find the ones with references, but not sure i will be able to use this same excel and reimport with changes, rows are weird the way they come out. XML field (lookup) often populates on more than 1 row.
Will see if mass update works and update here later
