But there is no Vanilla Ores in the first place. And one point of GT6 is to get to making Iron/Steel, why would you install it if you didn’t want the Tech Tree?
What do you want the easy Iron for anyways?
Unrelated, but making a Crucible work is not that hard, the Iron Recipe involves some type of Iron Ore, Coal/Charcoal and some sort of Limestone/Marble/Calcite etc. Or just melt down pre-existing vanilla Stuff like Iron Bars/Doors.