No, not really a runner, an amended P35 is there to correct an error in payroll.
You might get away with it, as you haven't yet filed accounts, a CT1 or personal IT return, but strictly speaking if you took an amount as salary, and both you (the individual) and your employer (ie also you as director) were aware it was salary and treated it as such, you can't go back and rewrite history. From a legal point of view estoppel kicks in.
This is an area Revenue have clamped down on a bit in recent years. The principle is quite important, as otherwise it'd be open season on people coming back to amend historic returns based on subsequent events.