Thats not a bad idea , maybe the screws with a thin frame cut out to the square (thin plastic or aluminium) and a couple of screws in the midle to help hold it up?
The problem with squirting in glue, is there is probably a lot of dusty, decomposing sponge type material underneath the lining and by the time you have enough glue to overcome the dust you will have a soggy mess.
The first idea of the screws has merit but will the sagging problem continue out into the curved area of the roof lining. If this is going to happen you may as well take out the lining strip it and recover it.
Life wasn't meant to be easy?decisions/decisions.
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