Further reading of the AMCs reveals this:-
AMC1 MED.A.030 Medical certificates
(a) A class 1 medical certificate includes the privileges and validities of class 2 and LAPL medical certificates.
(b) A class 2 medical certificate includes the privileges and validities of a LAPL medical certificate.
So a 9/15 pass should be enough, but I am not sure if there is any mechanism for adding a conditional night rating, ie "valid only when exercising LAPL privileges" on to an EASA CPL /PPL.