I agree with Rox Lemans, might be worth taking the pieces into a decent paint shop to see if they can salvage the original paint and refinish with some type of clear coat, if it worked, best and cheapest solution?.
I have heard of decent paint suppliers making up custom, quality spray bombs, but I don't think anything like that is going to come cheap either, and from experience, painting is a learned art.
I not only hoard motorcycles but info as well,lol.
I snagged this enclosed document that Mike from MPH had posted somewhere with valid paint codes for some of the modern guzzis, I don't see any V11s on the list, but I did notice a few greys that MG has used in the past, might be worthwhile comparing against yours for a possible match with greys on other models.
Ps, due size limitations I can't post the doc, if you want it, pm me an email add, and I can get it to you. While searching for Mike's original post I found a few posts that may help you out, I copied the link over for one that seems to have a lot of links and info, fwiw.
Good luck
Kelly