Some of what you request can be done with GregTech configs, without even needing Minetweaker scripts:
1. Re-enabling IC2 machines can be done in the "disabledrecipes" section of GregTech/Recipes.cfg by setting their entries false (so they're no longer disabled)
2. Changing "B:steel_true=true" to "B:steel_true=false" in the "blastfurnacerequirements" of GregTech/MaterialProperties.cfg will allow steel dust to be smelted to ingots in a regular furnace. iirc, the IC2 induction furnace just uses vanilla furnace recipes, which takes single inputs, so combining iron and coal dust wouldn't work in it. The GT alloy smelter should be able to handle such a recipe, though.
3. A few of the IC2 machines that aren't disabled by default have harder recipes that can be turned off in the "harderrecipes" section of GregTech/Recipes.cfg, but some components like the IC2 basic circuit would still need a Minetweaker script to restore the original IC2 recipe.
Yeah, was kind of hoping they would have deleted the first 3 posts because they were triple posts, the "quadruple" post had updated information saying that I had set up the config incorrectly for the basic machines. Should make the job much easier with those machines workings, just got to update the recipes for some things so no GT machines are needed in order to make the TI and T2 IC2 machines.