Need Help with Save Data and Multiple Accouts

Okay, here's what happened:

My son has been playing Plants vs. Zombies 2: Garden Warfare 2 on my Origin account.  Well, he wanted to play together in multiplayer so I made him his own Origin account and purchased the game a second time on his account so now we both have our own separate Origin accounts and we both own the game separately.

Here's the problem:

He has put many hours into playing on my account, has unlocked several characters (one of which he particularly loves), skins, etc.  Is there a way to transfer the save data from my account over to his?  I've been trying to find a way and failing miserably.  I assume this has to do with online cloud saves and not local saves.  I am having a lot of trouble - any help would be greatly appreciated!