I wrote a small python script to create seeds that can be piped into a seed checker as such.
Output
12:12
twist flush ranch screen yard film option walk stuff sick maximum stumble
Hmm... what's the point of throwing randomly selected word sets at your address checker? The chances of matching a 12 word passphrase are essentially zero.
I think your size calcs may be off a bit, too. I pre-calculated the RMD160 values for all ASCII 1 to 5 character words, and the output is about 0.9TB in size. To increase to 6 characters would result in a file size about 95 times that (about 80TB) and to go up to 7 characters would result in an output of over 7000TB. And consider the amount of time needed to check 135 trillion entries.
That's one of the interesting things about SHA256 brainwallets (so long as you're doing this for fun) : it can be easy to find them, but it's also very, very hard.
