I use a fork for Underground Biome Construct for 1.12 found here:
https://minecraft.curseforge.com/projects/undergroundbiomesconstruct-fork?gameCategorySlug=mc-mods&projectID=300938

This places stones in the world that are oredicted to regular stone and variants like cobble, stairs etc. When using these stones with tetra you can't upgrade tools. The screenshot below shows smelted stone, but I tried with the cobble variant first.

This makes the early game fairly unplayable when UBC is present, as there is no no natural source of cobble stone unless you spawn in the proper biome for it.