I mean, I don't know for sure but I wouldn't bet on us becoming stronger than the Chosen One if we both have a similiar timeframe. At least not much more so than a Combat Cursebearer.But we've been told that Scythe doesn't do much for a Cursebearer? He's already too overpowered to really benefit from it.
If we pick the Elves can't we just try to genocide everything not-elf hoping to catch our target in the collateral, and if we're lucky we can lure out some Scythe targets too. Just raze the continents, problem is that I don't know how strong a Combat cursebearer actually is, is this even a viable plan? No idea.