Most of those bits are cheap from a breakers.
Screen shouldn't be more than your screen excess, hopefully.
Front wings can be filled I imagine, then sprayed. They might be able to get away with blending but if it's all been done then yes, full respray will probably be easier
Probably £2kish for the respray, so hopefully not near their "% of the value to write off" limit!
If they do write it off, get evidence of how high the prices are for a good one (which I'm sure yours is) then get them to pay out. Sort the cheap bits for cash from a breakers or on here, then get the respray done somewhere good for a reasonable price and hopefully you'll come out a little bit up
Then you can spend the remainder on gates and CCTV
lol