A microchip implant? Good luck. How fluent do they expect you to be? I really thing that an intensive Berlitz Total Immersion Class may be your only hope. Very effective, extremely expensive. On the other hand, what kind of conversation are you expected to carry on? You might be able to design your own sort of total immersion program. Headphones embedded in your ears for a week, listening to language tapes, post-it notes of German vocabulary and usage all over the house; on the bathroom mirror, on the coffee pot, everywhere you go, someone drilling you with flash cards. Maybe that could work.