Now, what I think will be a major improvement as far as ease of use.  I'm constantly harping on the fact that too few in this world know how to create an accessible MS-Word fillable form, but I do, and that's what I should have done to begin with.  In this template, each line of the return address is a fillable field as well as each line of the main address, and each is announced as you land in it.  You also can't do anything but type in the content you want, so nothing can end up accidentally rearranged on the face of the envelope, either.  Just fill it in and print it.

So now you have a choice.  Use the one that just has lines of text you can change if you prefer it, or this one if you just want to tab between edit boxes and fill them in:

Commercial #10 Envelope MS-Word Fillable Form Template
--

Brian - Windows 10, 64-Bit, Version 21H1, Build 19043  

Science has become just another voice in the room; it has lost its platform.  Now, you simply declare your own truth.

       ~ Dr. Paul A. Offit, in New York Times article, How Anti-Vaccine Sentiment Took Hold in the United States, September 23, 2019