I had a similar situation this time last year when some p****ck 'modified' the front bumper on the 156. Got a few quotes from bodyshops which ranged from £650 to £870
- all it was was the bumper and the headlight washer unit!
I was going to put it through the insurance (I've never before made a claim in over 30 years of driving) and discovered that whilst my No Claims Bonus was protected, it wouldn't stop the base premium going up because I had now made a claim. So, I would still have my 60% discount, but it would be off a new premium of around £1000 rather than off the then £600.
In other words, it was going to cost me my £150 excess plus an increase of £160 on the premium.
If you don't have NCB protection as you say, the effect on your next premium could be much more noticeable as they'll put up the base premium and
you'll lose some of your discount at the same time. Not fair, but hey, we live in an unfair world.
I had a look on eBay and found a brand new unpainted bumper (couldn't find one in silver for love nor money) for £80, got a pair of headlight washers for another £10, my local spray shop painted it for £50 and it took me an afternoon to fit it. So with a little bit of time and effort, I got the job done for less than the cost of my excess and kept my unblemished record with the insurance company.
Just a pity that I had to go through all the aggro in the first place though.
Good Luck in restoring your Bella to her former glory, which ever route you choose.