@viajanete Yeah, I missed the part about the apostille for proof of income. At least for me this was confusing since it wasn't required when I received my initial CRNM, and after contacting the consulate it still isn't required for the initial application but is required for a renewal which seems a bit counterintuitive. I wish I had understood that ahead of time, but it is what it is.
Unfortunately, the obtainment of the notarized pension letter, then receiving that notarized letter and then mailing it to the Secretary of State of the notary jurisdiction, then receiving it back and then getting a Portuguese translation takes alot of time, potentially up to 3 months, depending on mail delays, backlogs, holidays, etc.
For example, my former employer only has notary services available once a week. The backlog for the Secretary of State of Texas is 30 working days, or 6 weeks. While I suppose it is possible to do this from Brazil, I believe it would be extremely difficult. I agree that it requires a return trip to the United States.
As I mentioned, once I get through all this I'll be writing up a guide - but in the meantime I would warn anyone who is contemplating a renewal be aware that you need to get this done - and the letter needs to be current, so you can't do it a year in advance. It needs be done about 3 months before you apply for renewal, further complicating the situation.