It might help that bizjets don't need to abide by ETOPS rules, so you might benefit from the fact that you can just point it east and let 'er rip. Barber Pole is recommended. Just stay above or below the tracks.
Not quite. They never let me do a crossing, but using the offshore routes down to the islands from the NYC area we were always getting speed restricted unless we were at 430 or better. Still getting restricted if there was someone ahead of us at that altitude.