Just stop.You assess the pitting to see how deep it actually is before conducting any rectification work
If the pitting is so bad it may affect the relationship pf the extractor to the bolt nose then why on earth would you continue ?
The Ejector plunger is always proud of the bolt face Scott (unless the weapon is loaded with a cartridge in the chamber and bolt closed) - it wouldn’t work otherwise
Firing pin depth is easily altered on most of not all Accuracy International actions (you should know this I hope ?)
Chamber headspace - again easily altered by machining the tenon shoulder and rear face
But (and I stress this point) as it’s clear that everything needs to be spelled out in simple terms
If the pitting is so bad - that the rectification work would unduly affect the extractor then you wouldn’t even start the work
Purchasing a new bolt is the answer
(A new bolt head would be the most cost effective part to replace if it were available in your country )