Drill exhaust manifold bolt - Remove head or not?

As the heading suggests, after having failed to remove the bolt using a bolt extraction tool (and of course managed to snap the tool itself in the bolt!) I most likely need to drill and re-tap the upper rearmost drivers side manifold bolt. The engine is in the car and I have reasonably good access as the manifold and steering box/shaft is out. But I’m still scared to drill it on site and get it straight as the bolt is dangerously close to the water jacket. Do you guys think I should pull the head? I’m planning to replace the intake manifold anyway this winter so maybe it’s just as well to just take it out? What would you do? Thanks!