Yeah, your initial seed is determined the moment you select your game on the DS Startup screen. Everything after that is frames. If you'd want to get those exact same IVs/Nature/Whatever, you'd have to do what you described, which I think is a bit unrealistic. However, it's not really hard to Reset for good egg IVs. All you need is for the game to generate 2 31s. Just within the first arbitrary 10 seconds I reset on, I came across a 28 / B / A / x / 31 / A seed, which would produce "almost flawless" physical mons. I'm still resetting onward hoping to get a 31 where that 28 is, but I think you see, it's not that terribly hard to find a completely usable seed.