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Okay, let me break it down once more, because I feel you may have missed the main thrust of the topic:
We are talking about playing in a 1.0 world before IC2, and having the needed resources in your current chunks.
The inability to disable ore generation in IC2, and your concern over duplication of ores, is irrelevant because IC2 is not part of the setup.
If you were to disable RP2 and Forestry ore generation, you'd have nothing - and might as well not bother.
So... when IC2 makes it to 1.0, you then go in and disable the generation of other ores. You don't have to worry about ore duplication in the chunks you've already spawned because that was before IC2 (and so no IC2 ores were generated there). You don't have to worry about ore duplication in new chunks because only IC2 ores will spawn there.
And you don't have to worry about inventory management of two types of ore because once you smelt or macerate them, they're the same. At any given time, you'll only be getting one "brand" of ore anyways.
So, given all of that, could you please elaborate on any remaining issues you perceive?
Hey, I'm not dumb and the OP asks for a MOD specifically designed to pre generate placeholder ores. Or some alternative of getting the same results.
Keep in mind then that, if you start with just RP2 ore generation you only get as much ore as RP2 will generated. If you had IC2 generation as well then you would get more ores.
Problem with that is what i already mentioned, the ore blocks do not stack. Hence why I suggest another alternative where he can spawn the ores he wants. Be it RP2's block ID's or IC2's block ID's, doesn't matter which.
You clearly don't understand my intentions so maybe you should just leave it at that...