This is what insurance companies do all the time.  

I'm afraid though that it is going to be hard to find anyone to take you up on your offer because on the surface it doesn't sound that great, risk 250 BTC for .3 BTC.  

An insurance company might also want some verification that you actually have 250 BTC in btc-e however and that when it is recovered if btc-e goes down the 250 BTC go to them (since they will have already paid you "your" 250 btc).  However, you've explicitly said you wont verify that, so this is just basically a short term option (or high odds bet) on btc-e.

Good Luck!