Hi KuyaReCom, welcome to Hetalia Archives! We hope you enjoy your time here!
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If you have any questions, please leave a message on my talk page!
Hello! I'm not sure what you mean by this "new pairings template". As far as I'm aware, we're still using the same template as we always have. I think User:Night the cringe2 made some changes to the current template which added a few new fields. You're welcome to fill those new fields out or omit them entirely, since it won't break the template if you decide not to. Night's edits look good to me, so if you decide to use their template go right ahead.
If you have any other questions feel free to message me again!
Re: Canon AU Pages
Actually I don't think we have any pages specifically dedicated to canon alternate universes! I'm guessing that this was because Himaruya used to keep his AU's brief, and limited to maybe a few comic strips or 1-2 anime episodes. We do have pages for some special episodes like Hetalia = Fantasia and Episode 121 (Nekotalia), but none dedicated specifically to these AUs.
I think it's a great idea to make some pages for alternate universes, like Nekotalia, Nyotalia, Gakuen Hetalia, and Hetalia Fantasia: those that are represented in official manga and anime. Some, like "2p!talia" and "3p!talia" are mostly based on fan speculation so they wouldn't make good articles, but the ones you mentioned would be good. Since we don't have any articles on them, you're welcome to create some and model them after the Creatures of Hetalia page or something. Thanks for your help!