I haven’t modded as of yet but I started off with Java and am now a C# Dev and the transition wasn’t too hard since most of the same principles apply to both languages. Unity games, that are often written in C# to me are the most moddable ones, especially considering that there’s a ecosystem for Unity mods out of the box
Just make sure to enable Airplane mode beforehand, to ensure your phone isn’t trying to connect to cell towers while it’s in a Faraday cage, because the added battery drain might prolong the charging process