For converting look at this one it can reconvert back into the source folder or folders
https://www.mediahuman.com/audio-converter/
As for batch tagging try MP3 tag it's free and you can get both on Mac or Windows
6 inch cables are the shortest ones I managed to find on amazon. Which is weird cause I'm almost positive someone makes shorter specifically for dap usage
If I got one of these could I run regular headphones like say, One Odio A71, from the Balanced Port and "Get More Power?"
https://www.amazon.com/Female-Balanced-Adapter-Weaving-Coloer7/dp/B07DFKCL2C