The WIP pull request is here:https://github.com/citra-emu/citra/pull/4868
This allows for textures to be replaced so Hi res texture packs can be made.
and here are some quick tests with the 3ds port of Soul Hackers using Ai Gigapixel: http://www.framecompare.com/screenshotcomparison/JBEB1NNU
I don't know if you care anymore but these could help
Official Discord: https://discordapp.com/invite/vinesauce-official#VineCord
Reddit: https://www.reddit.com/r/Vinesauce/