Little tip I just discovered with simple bookmarks... I have started cutting them out of vellum and spraying the back with adhesive that will become tacky if not immediately glued to something. The kind that you resurface your cutting mat with. My bookmarks now stick to the page but are removable like the Post-It Notes. They no longer will fall out of a book.
Now with your corner pattern, I think I will cut out a 'spray shield' so that I will only apply the adhesive on the inside of the front triangle. Hope I am explaining myself clearly??

Will post pics of completed corner bookmark I make with your svg file.
Thanks again!