That wouldn't work either. Even if to make it so every 3 blocks can be rewarded to an address (let's say), then you can simply write your own wallet that will use randomized addresses and simply forward their reward to the pool's wallet, which then distributes to the "real wallets".
The only way you can truly prevent pools from taking over is create a system of authentication that'll destroy anonymity.
The only way you can truly prevent pools from taking over is create a system of authentication that'll destroy anonymity.