you mite be able to get some packageing foam,if you cant get a piece big enough , join them but I would do everything in squares , you only need a smear of glue if I your glueing a flush joint , same as the repair if you could square that up a bit im sure it would be easier to do the repair, don't take my word as gospel , maybe someone else can have a bit of input
have you checked out what looks like a stress fracture between the pads and the repair