Correspondence within document printed all blocked

Greetings!

Let's say I have a document that is printed all left-flush, and I make the decision to use indented paragraphs in braille (i.e, I apply the Exception covered in BF2016 1.9.3). Then let's say that same document includes a boxed [or displayed] transcript of a letter, and all the components of that letter are printed left-flush (date, opening, body, closing, and signature). Lastly, let's say this document is not an instructional text on "how to format a letter".

In this scenario, could you tell me which of the following you would recommend?

1. format all components of the letter in 3-1
2. format all components of the letter blocked  in 1-1, with blank lines between
3. format the date as a cell-5 heading, the opening blocked, the body in 3-1, and the closing & signature as a two-line attribution.

Thank you so much for sharing your insight into the intentions of BF2016.

Sincerely,
Kyle DeJute
Braille Trainer at APH