“Essentially, the external drives will be treated the same way I treat tape today. The advantage is that I have nonlinear and immediate access to that footage at any time.”
The AJ-SPX800 has 5 P2 slots and it’s hot swappable. If, and only if, the AG-HVX200 has more than one slot, and it’s hot swappable as well, then it makes the amount of continuous footage shot limited only to the size of your external hard drive.
You will need more than one P2 card.
And yes, you will need someone to do the swapping while the shooting is taking place. The operator can’t do it, but I do know that ACs are capable of learning new tricks. Don’t have an AC position in the budget?
Pay a bright PA $50 more to do the swapping for you. They have the tech skills. Many of them are building their own computers to play games on.