Strictly speaking, the "apply them to any character" would have been aimed at the pre-gen characters or at first time players that came with a made character (typically from the make a character sessions.) That being said, I know at many tables the rule of thumb is, that you may mulligan a character after the first session/con (I say con because you don't have the time to rebuild at a con if you keep jumping from 1 table to the next) and that any rewards you earned will still apply after the mulligan.
The only thing that is helpful for you to keep is the name so other players may remember when they ran with your character before, but even that is not exactly set in stone.
As such, my interpretation is that the rigger will only have the one reward, but you'll be well within your rights to rebuild and play the character after Rigger 5 goes legal. (And yes, you can rebuild in PDF, but would have to wait till 30 days after dead tree to play it)