I need 10,000 miles exactly to make Platinum this year on Delta.

1. I will have 65,000 skymiles by Dec 25th
2. I'm looking for the best way to acheive 10K miles only traveling in First Class. I dont want to schlep in coach for that many miles.
3. Dec. 25th is the ideal time for me to travel out of Atlanta
4. I'm currently booked from Atl to London-Gatwick for same day turnaround on the 25th-26th that gives me 12K miles in Business Elite for $2K ticket and 50K miles upgrade.
5. I looking for any better alternative that will get me 10K skymiles. I chose International travel since 10,000 miles in BusinessElite is way better service than domestic first class and going to LA twice in three days.

Any ideas are welcome.

Thanks,
Jon