True, that's quite nice. Once I tell everyone the process, I'll could publish the last hash in the blockchain -- and use the block hash as the "client seed". If you don't mind, I'll send you all the details before I push the button and you can do a final review?
Of course you need to tell us when you're going to do it, not after you've done it - or it has the same problem (you could generate 100 chains, publish all their hashes in the blockchain, and pick the one with the best client seed) - and even then posts can be edited, so you'd probably want people to quote it before you send it to the miners.
Then there's the concern that maybe you rent a bunch of hashrate so you can pick a nice block hash... (withhold the transaction from other miners, so you know you will mine it; check the block hash before broadcasting the block; only publish the block if it's "good") but I guess however you do it there's scope for cheating. If you have me pick the client seed people can suspect us of colluding.
And yes, that's fine. I can review it for you.