It can be done by macro.
Rows("2:2").Insert Shift:=xlDown, CopyOrigin:=xlFormatFromRightOrBelow
' default is xlFormatFromLeftOrAbove
microsoft excel - Changing line insert default formatting - Super User
This would be the closest option for a solution and thank you for providing an additional source explaining a possible solution.
Unfortunately, it wouldn't really help in environments where Excel Macros are restricted or prohibited and where there may be Accessibility concerns.
I think for the purpose of this forum post, all possible solutions were explored.
Summary
Question 1
Q: Is there an accessibility option for activating the Insert Options button in Excel?
A: No. There is not an option similar to the (Ctrl) that comes up with the
(Paste Options) button.
Question 2
Q: Does Excel currently support the ability to activate the Insert Options button in Excel similar to pressing "Ctrl" when pasting (Ctrl+V) data?
A: No.
Question 3
Q: Regarding Question 2, is this an accessibility feature that currently exists or is planned to be added?
A: Unanswered/unresolved
Follow-up Q: Is there a way to report or request this feature?
Question 4
Q: How do I activate the
(Insert Options) button without using a mouse?
A: There is not option or feature to activate the Insert Options button without a mouse; therefore, an alternate procedure must be performed.
Question 5
Q: Can an Excel macro be leveraged to circumvent the Microsoft default formatting setting of taking the cell formatting from either the left of an inserted column or above an inserted row?
A: Yes:
Rows("2:2").Insert Shift:=xlDown, CopyOrigin:=xlFormatFromRightOrBelow
' default is xlFormatFromLeftOrAbove
microsoft excel - Changing line insert default formatting - Super User
Question 6
Q: Does an option exist for taking the cell formatting from either the right of an inserted column or below an inserted row that doesn't involve a macro due to an environment where Excel Macros are restricted or prohibited, or complex work around where there may be Accessibility concerns?
A: No.
Based on Follow-up from Question 3 above, is there a way to report or request a change to the Insert Options button to improve Accessibility and efficiency?
I am good with calling this forum post resolved and that a solution is available for most cases. Thanks for the assistance!