A lot of target shooters removed safety devices simply because they never used them. A pure target rifle was never loaded until it was ready to be fired, so a safety was just a nuisance, especially the original Model 70 type that was nearly impossible to operate with a scope in place.
I don't see any problem with just replacing the safety (along with the spring and plunger); only a super-purist collector would worry about a minor part replacement.
Replacing the safety is no big problem, but be careful of failure of the sear to reset. When you get the safety installed, cock the gun (unloaded, of course), put the safety on, and pull the trigger. Then, release the trigger, and without touching the trigger, take the safety off. If the firing pin falls, take the gun to a gunsmith, it is dangerous.
Jim