I hate to "chime in" and give advice in such a murky area --- I have no doubts about the 1962 Missal's liceity, and no real reason to doubt the validity of John XXIII's papacy. The addition of St Joseph to the Canon, I wouldn't have done it, but it was done, and I'm not going to go to the cross, to fight or argue against it.
Why I'm even joining in the discussion, is that if you have scruples, and if you know you have scruples, it's not the best idea to be asking strangers online for advice. I strongly recommend that you find a traditional priest you can trust, and do whatever he tells you. Please quit trying to figure this out on your own. I'm just concerned it won't end well, without direction from a priest.