What a tale, you must be double gutted! First to have your bike nicked then to have your insurance company pull that old scam on you, you're not the first person to be done over like that but at least when I had my crash last year I could argue the toss with the insurance assessor (who wanted to write it off) to get my bike rebuilt, if it had been nicked the derisory 9k they offered me for a 3 week old 998 wouldnt have gone far
Good luck, dont let it put you off!
May not be the same as your dearly beloved corse 750 but there's some nice 2nd hand bikes on the site for sale.
:burnout: