There is an alpha of Hadite Coal for 1.12.2 on CurseForge now. It should actually be complete and fully functional, I just haven't tested everything, and there is no language support except US English, because, alas, I am not fluent in other languages. Any translation help is greatly appreciated.
I've have rolled the "mod loot in chests" part of akkamaddi's Addenda into Simple Ores2, if anyone remembers akkamaddi's original mods. The Netherrocks and Fusion loot items bits will be rolled into the respective mods, as will the fusion recycling bits.