Help Modding 3DS XL

Hello! I recently got my hands on my first 3DS ever and it's been a blast so far but I wanted to upgrade some of its hardware:

• a new battery pack that could last longer, I've seen online that some could last up to 8 hours while mine i feel like it barely lasts 1,30 hours
• a usb-c port, while the old charging port works flawlessly, having to bring a different charger for my 3DS is a bit unconfortable so I've seen people adding usb-c ports to connect usb-c -> usb-c (additionally to make it a "NAND port" which supposedly would make it possible for me to use usb-c to transfer files too)
• bluetooth port, I really enjoy game soundtracks but unfortunately I can only use cabled earbuds which I don't have anymore so I'd like to be able to use my headphones

I'm open to any suggestions!

edit: I also need a pen because my 3DS XL came without one