DND 5E Character Sheets – What are Hero Points?

Your character can call things differently than your character sheet. If your sheet says "greatsword," but your character keeps referring to his zweihander, an AL DM would not have any grounds to stop you, as there are no rules for role playing (aside from alignment restrictions, rules of conduct, etc). You can play a halfling that insists, in character, that he's a hill giant, or calls his dagger a potato, so long as your character sheet is AL legal.

As for what is considered legal to put on your sheet, Jeremy Crawford tweeted in response to a very similar question on 9-May-2016:

The wuxia weapon names in the DMG (p. 41) are available to a member of any class, if the DM gives the OK. #DnD

So, only those weapon names listed in the DMG can be used on your sheet, and only with DM approval. Without it, only those listed in the equipment chapter should be on your sheet.

Source: https://mobile.twitter.com/JeremyECrawford/status/729786362010869760

Your ruling is unlikely to break anything. However, the rules on their own (and the underlying fictional significance of the rules) appear to answer this with a No.

The surface rules difficulty is that a there's no object duplication involved — you start with a spell scroll and end with a page in a spellbook. These aren't identical objects, as the ability requires.

One might argue that they are the same, just with one bound into a book and one not, but spell scrolls and spellbook pages aren't functionally interchangeable either. They function differently and contain different information: you can cast a spell off a scroll, thereby destroying it, but you can't cast a spell off a page in a spellbook in the same way (and if you do it as a ritual it works differently, and doesn't destroy it); similarly, understanding the scroll is harder than understanding the page in the spellbook. The two objects are distinctly different and the kenku's particular skill doesn't come into play.

But this mere rules difference reflects a deeper meaning: how learning spells from scrolls works in the fiction. The normal process of “copying” a spell from a scroll into a wizard's spellbook actually involves a translation: from how the scroll presents a ready-to-cast spell, into a record of the wizard's own personal understanding of the nature and process of preparing and casting the spell. The Arcana check for copying appears to represent the possibility of failing to extract the necessary understanding of the spell from the scroll's not-a-spellbook formulation, and thus the possibility of being unable to scribe the spell due to simply failing to actually learn it from the scroll. Being good at duplicating things doesn't help with learning arcane secrets of the universe.