You shouldn't have a problem recovering well after your 1500. You might not PR in the 400, but I personally have had some really good races over 1500 and 800 that were run that close. I wouldn't jog for the full 30 minutes though. Consider something like this:
Walk for 5 minutes
Jog for 10 minutes
Rest with feet inclined above heart for 5-8 minutes
Jog for 2-3 minutes
Do a few quick strides to activate for 400
As for a last workout, here is what I did 4 days before running my PR (3:44.73):
2 x 200m at 800 pace (:27.5, :27.5)
800m at 1500 meter pace (2:00.5)
300m accelerating each 100 to simulate kick (:41.7)
Recoveries: 1 minute between 2 200s and 3 minutes after everything else.
Adds up to 1500m and is designed to simulate building up fatigue over the first 400m, running strong through the middle of the race and then kicking. This worked quite well for me: My middle 800 was 2:02.0 and my last 300 was :42.9.
The only change I might make in your case would be to do 4 x 100m at 400m pace with 1 minute recoveries in place of the 2 x 200m.
Good luck!
Jerry