Genshin Impact: I Have Kakashi's Template

Looking for Stories About Playing Characters from Other Anime in an Anime World!!! _(:_"∠)_

Looking for a New Cosplay-Template Novel, Preferably Featuring Honkai: Star Rail, Genshin Impact, and Honkai Impact 3rd

I want something like "Honkai: Star Rail, but My Cheat Lets Me Transform into a Honkai Valkyrie". There are already way too many stories about national destiny and rule-based horror games. I'd prefer one where the characters cosplay in the real world. I hope an author will come up with something new, or at least write more stories where a System lets the protagonist transform directly. Being able to turn into multiple forms would be great, of course.