Problems with larger .pkg

Hi, i'm new on this forum and sorry for bad english :(

I've an old Ps3 40gb with Rogero cfw 4.30.

I'm trying to play Ni No kuni the PSN version (5.8Gb + 16Gb, double pkg files).

I've this problem:

my ps3 have only 31gb of space in the internal hdd (after a format) so i can't install the 16gb pkg because 16+16 = 32.

Exist some method to install these pkg without transfer into the intern hdd before the installation (maybe directly from the external hdd)????????

Thanks so much.