Not unify to 𠄌.

According to IRG N2606 Kushim Feedback, the author suggests unifying to 𠄌 per liding unification rule, though this rule is not mature enough.

Generally speaking, this glyph is a radical, stroke, or a symbol. I found only one piece of evidence consider it as a character.
六書會原

Maybe we needs to update the annotation for U+31C0 ㇀ as below. (Note: XXXXX means the code point for this character.)

31C0 CJK STROKE T
* 2nd stroke of 51B0
x XXXXX

Agree with #10850, and I set a reminder to add such a code chart annotation to the CJK Strokes block.

To follow up on #10917, the code chart annotation for U+31C0 is reflected in the CJK Strokes code charts in Unicode Version 17.0.