Unfortunately, the answer is no with official version.
BS2_EnrollUser API transfers the total BS2UserBlob structure. SDK overwrites the total user information whenever it updates user information.
If you don't want to waste memory in your application & don't use user profile picture, you can use BS2_EnrollUserSmall instead of BS2_EnrollUser.
The BS2UserBlob structure includes BS2UserPhoto, the largest capacity of the userblob. However, BS2UserSmallBlob can greatly reduce to hundreds of bytes of structure.