^^^ make sure you'll be able to insert it far enough for that new pin hole to line up. There's not a lot of depth behind the receiver. You might have your guy lop 3" off the ball mount shank too while he's at it.
Interesting didn't even cross my mind to do that! Are there any concerns at all with that? Just measured the clearance on the Subaru hitch and its only 2"I needed a 2" drop and bought a Curt fixed drop. It extends further than the stock Subaru 6" drop but I'm going to have a machine shop drill another pin hole 3" closer to the ball end. This will pull the ball forward to the same as the stock ball mount. My old Draw-tite 0" drop actually had 2 pin holes as purchased but raised the coupler too high.
I put masking tape on the side of the bar, put it into the receiver until it stopped and backed it off 1/4" to provide some rattle room and marked the tape with a sharpie through the pin hole. Now I've just got to get to a machine shop.