Your proposed change plan is very beautiful. However, there are two problems.
This plan is a matter of A and B parts.
The "conversation group" function of B marked in green is valid in FE8J. (I think that it is also valid on FE8U. maybe...)
Several FE8J remodeled works use this conversation group.
And the biggest problem is the A part marked in red.
There are a lot of FE8J remodeling that uses unused areas as special flags.
This tool is a MOD function and supports them.
In the example of this image,
We use three extensions of command patch(指揮), individual animation patch(個別アニメ) , skill patch(スキル).
The skill patch of FE8J uses the unused area of the unit setting as the setting value.
The command patch, like FE5, creates a commander's correction.
Individual animation supports individual battle animation function like FE7J (FE7U).
By using the MOD function of this tool, you can assign a name to the unused area.
By giving a name, users can work comfortably.
So, even if it is an unused area, you have to refrain from erasing the name "??".
Because, if you delete "??", the user can not use MOD function.
I do not want to lose extensibility, including extensibility for the future.