TBH the plastics you can sort, no real issue there. Soldering iron, plastic bars and sandpaper. Then re-paint.
New mirror £20 ..
The footrest hangers are designed to break.
I have broken one wheeling the bike out of the garage - they're made of soft cheese.
Again £10-20 on ebay.
The can you can fix, just stubby it and use a rivet gun to re-attach the end.
The swingarm will likely be fine, but if not you can pick one up off ebay or from a breaker for £40.
I got my H2 swingarm (non braced) for a whopping 99p off ebay.
A weekend's work ..
Chin up!
It would be a write off if you claimed tho ..
Up to you init.
I'd write it off as a cat D and then fix it or break it.