Filevault 2 on Snow Leopard?

Title seems improbable, but is it possible to view, copy, or otherwise modify files on a filevault 2 protected thumbdrive created in lion on snow leopard?

Long story:

My Seagate Momentus got trashed recently, so I'm going out to get a replacement tomorrow. That drive was updated to Lion 10.7.4. I am typing from a Snow Leopard 10.6.8 HDD. I actually need that data on the new HDD, so I was thinking of getting one of those USB-SATA adapters. (The macbook won't boot off that drive, won't detect other drives... Swapping internal drives is tedious and it won't boot from the trashed one [duh]). But there's a 50% chance that the important data is on the thumbdrive, so I don't want to waste the money on an adapter.

So here's the problem: Is there a way, external program or not, to read that data from the disk? I know the password, but I am not willing to risk modifying this splendid backup HDD with a fully working system on it by installing Lion.

I tried mounting it, obviously it doesn't work. DU tells me it's an "incompatible format".

Tl;DR: Can I read a Filevault 2 partition from snow leopard?

Thanks