Want a Player ID in game that isn't a PN ID with 10 digits trailing? You can customize these as you wish in the JP version. Evidence by my friend list below.
Do note that wording will most likely be different in the official NA release, but the option should be in the same location when you log in.
Step 1: Log into your ship, but don't progress to Character Select.
Step 2: Choose 'Change Player ID Name' from the Support Menu. You are eligible for one free name change per account.
Step 3: Enter your new Player ID Name:
Once this is entered and accepted, your name is changed to the one you entered.
Step 4 (Optional): If you are unhappy with your new name down the track, you will be able to change your Player ID Name for a fee.
Note: Fees may be different from that of the JP version, so take this with pricing with a grain of salt.
Now you get to roam around the ships without looking like someone who just downloaded the game!