I'm glad I was able to help :)
That makes perfect sense. Yes, in that case the sexlinking could be quite useful.
I don't personally know how to vent sex chicks, but from what I have read it is not particularly easy. So there is a chance that sexlinks might be the best choice anyway.
One more...
Yes, that should work fine.
It should work, but for most people it is not worth the effort of keeping separate pens.
Early sexing only matters if you are going to treat the sexes differently. If you are going to raise them all to butchering age, then butcher the males and keep the females...