I would definitely clear any post-manufacture additions with Motability and Direct Line before you go ahead. You will need their permission to make changes which take it outside a factory spec. Adding packs is fine if during the build, but picking and choosing bits afterwards is probably going to be problematic, if the experiences of others on here are anything to go by.
It’s still the dealership who would be adding those extras so I couldn’t see a big problem. The extras will be on the receipt, along with the AP so I don’t see much of a problem. The dealership I spoke to didn’t seem like they’d be a problem although he was chasing the price of a night pack up.
As the CLA itself, I came away happy enough, but I drove a Q4 S-line not too long ago and I’m thinking O want another test drive in that before making a decision as the AP is around the same.