Can confirm Novo are fine with PPF. Don't know about full colour wraps though.
I think expecting a "high street" insurance company like Direct Line to do bespoke policy features is probably not going to happen. If you have a conversation about PPF with them they'll just say "computer says no", and if you don't tell them at all they could - with some legitimacy I would think - claim it was a modifcation/material fact that was not disclosed, and attempt to disclaim liability in the event of a claim.
This has been worrying me for some time and I just got around to web chatting with DL.
They've noted the addition of PPF and Dechrome on my car as 'decals/stickers' added. No increase to premium, no charge to update the policy and they're sending the updated policy out in the post.
Had to wait a bit whilst the adviser checked, I think they were aware of PPF but not dechrome but eventually confirmed that everything was OK. I made sure to have the chat transcript emailed to me