Don't break it by fixing something. That's how I roll. The freeze plugs you are talking about are hard to get to. Leave them alone until they start weeping. Its not like they are going to blow out and spew all of your antifreeze all at once.
I am not a big fan of Stop-leak, but if one of those hard to get to plugs began to weep, I would use it. Especially if a rebuild was likely to be done in the next 5-10 years. That would be a better time to change them.
Bottom line? Drive it and check everything as you normally would.
