First off, in order to provide a "Coherent argument for YEC", it would require a detailed, scientific, technical-laden approach that disproves each claim of the "Science" behind the Old Earth approach.
And then, even then, if I provided some irrefutable concepts that cannot be reconciled with an old earth account in astronomy, biology, geology, oceanography, or whatnot, your defense could be "Some day Science will one day figure this out" even if it outright defies such possibilities.
As for your bonus points, once again, this brings up the issue of theoretical (and oft-semantically abused) "Macroevolution" (Which is in reality, not exactly what is observed except in a technical semantic definition) versus what is actually observed, "Micro" evolution and "Neo Lamarckianism" or Epigenetics.
And if I presented Creationist literature, would you even look at it? Would you even bother to address the claims made in it or would you write it off?
Never mind that 95% of the National Academy of Sciences is made up of declared Atheists, there's obviously no bias in this field of "accepted" science or else you're a "Conspiracy Theorist" if you point this out and question the "authority". Even with all the recent trends of industry-funding in science, when it comes to this particular issue, you can't even possibly question the consensus having a bias and status quo.
So before an argument is even made, what kind of basis would you even accept as something you'd consider as a valid argument?