Thank you for your question, Susan!
We think it is alright to use the visible space symbol without any grade 1 indicators as long as it does not follow a letter.
If we use the one-cell visible space symbol instead of the box that print shows to indicate an omission, we should explain that change in a transcriber's note. For example, "The visible space symbol .=+ is used in braille where print has a box."
A possible transcription of item 1 from the print you shared is attached (as a picture and as a BRF).
What do you think? Does this help?