I'm not sure if I understand what you want to say here.
One point of what I want to say here is that the following
description is not enough:
"Latin letters of acronyms are upright, while words and sentences in the Latin script are typically sideways."
The second intended point is:
It seems to me that you neglect to research the actual Japanese vertical publications before defining the proposed default orientation. Until now, I have not seen any evidence that you have gathered before determining the proposed default orientation.
Antenna House, Inc.