The short answer is yes, but watch the heat spread use heat sinks and heat stop paste. Drilling will be a bitch as the weld will be as hard as a whores heart.

If one is not going to go with true strikers but just bushing the existing firing pin holes for smaller pins, then drill them out about 5/16 to suit thread using a counterbore drill with a pilot ground on existing firing pin size with a 1/6" step to form a shoulder 3/8. Tap for a fine thread. Turn up bushes in 4140 or similar, correct length with shoulder with a smaller firing pin hole about .080". leave them too long so that you can grab the sides with a pair of grips. Put some black loctite on them and wind them in. Leave for 24 hours, cut them short and file flush. When you get close use a fine hone, not a bastard file!

Regards