I see your intention. I even suggested it more then once on the forums.I just think you got the wrong approach.
by disabling iron ore smelt into plates and forcing to use metallurgy you are only delaying early game since it needs more crushed ores for the plates.
In my opinion the problem really comes from electric furnaces and worst, bobs furnaces. Let them smelt all the ore they want, but being restricted to stone furnace. Prevent the other furnaces of working by doing some category-fu on the furnaces.
This way, player has two choices. Use a massive amount of slow and coal consuming stone furnaces or move to metallurgy. No more 2 beaconed multi-purpose electric furnace mk2 with a lot of mod slots outputting thousands of plates per minute!
