If you're going against an adversary capable and willing to drop multiple zero days to breach you, let alone 11, I wouldn't wager much on a simple system wipe g

If you're going against an adversary capable and willing to drop multiple zero days to breach you, let alone 11, I wouldn't wager much on a simple system wipe getting you back to a good state (iOS or not). Given the price of iOS devices vs good security consultant hourlies, the easiest and most effective clean-up for a few devices is likely just starting over.