Hello, Ronnie
You've posed a very interesting question regarding sidebar material within line numbered text. I'm not sure if you meant to pose this question to the Literary Committee, since it is a formatting question. It would be better to address the question to the Formatting Committee.
I would like, however, to offer the following:
Based on the question, that if the sidebar material is going to be transcribed within the body of the lined numbered text, then the two cells at the right margin should be followed.
Braille Formats:
15.3.1
f. Resume using the full width of the line after the completion of the line-numbered text.
g. A transcriber’s note can extend to the right margin when placed before the beginning of, or following the end of, the line-numbered text.
Also, assuming the sidebar material is being placed in a box.
Braille Formats:
7.3.3 Start the top and bottom box lines at the left margin and extend them across the full width of the braille page, regardless of the width of the print box. The width of the braille page is dependent upon the format of the material being transcribed.
I still suggest consulting the Format Committee on this issue.
Agustín Peña