best 3000m workout

This close to the race, you can't really do anything big, physiologically speaking. Really, the best thing for you would be to try to get comfrtable at goal pace. You've done quite a bit of faster stuff, but not much where you have had to mainain a consistent pace for a longer stretch.

Bearing in mind that 2 weeks out is not the time to introduce any radically hard workouts, I would go with something along the lines of 2-3 x 1k @ 3k goal pace. Take plenty of time in between 1000s. The goal shouldn't be to blow yourself away with these runs, rather to get comfortable at goal pace. You could safely get this workout in 2, maybe 3 times, as long as you make sure to run controlled.

Keep the mileage going. Take an easy day or two in the week leading up to the race

Thanks, coach. That's just what I was thinking, too.