Typical American customer: if they can't buy it from summit, it doesn't exist LOL.
There's no reason a stock oil pan couldn't be modified to fit the girdle. Whether the girdle is a benefit is yet to be seen though. I would think the caps moving on the block would be a problem first. Then there's members running 9's with stock 360 blocks, and I've yet to see any pictures of blocks destroyed by making too much power. More than likely, the valvetrain will cause catastrophic engine failure long before the block does.
That said, a girdle design like that might enable one to feed oil to the mains in a way that helps prevent oil loss at the rods during the highest loads on the wristpins? I could see an application there, for sure.