I, like a lot of others, can't stand the standard neck strap on my K200. I've looked around at after market shoulder straps etc and the most promising of the lot - R-Strap - didn't seem to be exactly what I wanted. What I didn't like about the R-Strap was the way it used the tripod mount and stuck out the bottom, adding to the size and anchoring from the bottom of the camera.
My solution is to add a mount in-between the body the battery grip. This has the advantage of not getting in the way and allowing the camera to hang lens down naturally (required with long, heavy lenses). I've used this on vacation, hiking and for general shooting for a few weeks now and love how easy it is to carry now. It's easy to bring up to use, comes to hand naturally and I can wear it over my backpack without issue.
I tried a few different options to make it, including; a single piece of metal, metal wire and contemplated using material (probably canvas) with metal loops. While visiting Home Depot for better materials I stumbled upon ring hangers (pictured below) that looked promising and worth the couple of bucks to try. After drilling the hole larger for the grip screw and flattening the metal flush with the loop, it mounted perfectly and has been on my camera since with an old Optech nylon shoulder strap attached.
This design is not perfect and I intend refining it when I can. The thickness of the metal prevents the grip from sitting fully against the camera, but the contacts still work fine for the grip buttons. I was wary that the clip from the strap might impact and scratch or break the LCD, but this has not happened at all (I'm still looking for a plastic clip to substitute).
I'd like any feedback or suggestions for improvement, but I am very happy with how well this works.