Question about creating World of Warcraft fan content

Hello,
I run a small YouTube channel dedicated to World of Warcraft, and I would like to grow it by creating different types of content: machinima sketches, guides, and videos about the game’s history and unavailable elements. I have several questions regarding this:

Machinima and sketches.
I was inspired by the The Wrathgate cinematic and would like to create similar videos. However, doing this in the official game is technically challenging, so I am considering using a local offline server for filming. Is it allowed to publish such videos on YouTube if they are made in a non-official client?

Unavailable content.
In an offline version of the game, it is possible to access cut quests, items, test zones, and other hidden elements that are already documented in fan resources (such as Wowpedia). Is it permitted to create videos about this content and share them publicly?

Guides and in-game mechanics.
Using an offline environment makes it possible to examine triggers and boss mechanics in detail. Would it be acceptable to show such materials in guides or educational videos?

PTR.
Is it allowed to intentionally search for bugs on the PTR servers and stream/record such findings?

I want to emphasize that I have no intention of harming Blizzard or World of Warcraft. My goal is to study the game, share knowledge, and create fan content to support the community.

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