If it’s gone down to just the primer then it should be ok, had similar quite a while ago now though, only it was a bicycle peddle on the pavement side.
I rang rsm and told them the damage and they said, you can have it fixed now and pay the excess or you can leave it to the end of the lease and we’ll sort it then. As it was not down to the metal I left it and i got my full gcb A few months later.
Depends also how far your into the lease you is, as to if you want it repaired. ie do you want to be driving it around keyed for say a year or 2, but if it is an issue, it would also be cheaper to pay the excess and then get the full gcb. That is if there is enough time before you colleced the new car. Say it happened the week before you was due to exchnge there probally would be no way to fix it in time, but if you declared it to rsa then i would imagine you’d get the full gcb and you’d pay the excess.