Anyone-Can-Spend is normally done with an empty scriptPubKey, not OP_TRUE. 0x51 is used to redeem it, not create it. You can try to redeem it with OP_TRUE, but now it'll look like a double spend against the (apparently bogus) transaction already roaming the network.
Oh, and now that you've drawn attention to it, you'll be racing against bots trying to spread their own versions that spend it to their own addresses.
Thanks... looks like this is not redeemable with a standard tx. I guess numerous people have tried before me but none succeeded.