Hey there, signed up just to post this.

I wrote a guide on GBAtemp on how to change your joycons into the animal crossing ones in software.

You have nothing to fear, it won't ban your switch or anything crazy like that. All it does is change the hex colors the joycons idenify as when connected to the switch, to that of the NH ones. Once you check your mailbox, you'll find it in there. You can also revert to your stock colors in the app.

https://gbatemp.net/threads/tutorial-how-to-get-the-animal-crossing-new-horizon-exclusive-docked-switch-with-any-joycon.560297/#post-8979521

Do your best! Good luck!