[AggieDad]

Here is a neat idea that may work for you if your shoulder gets a bit tired when you are lugging that Bigma (or similar sized) lens around on a field outing.

I picked up this belt hook at Lowes for a couple of bucks. The hook rotates with a click-lock mechanism.

With my camera strap extended to a "sling" length, I can slide it over one shoulder and then hook the hand grip/tripod mount of the lens into the hook. Now a lot of the weight is transferred to my belt, leaving my 72 yr old shoulders feeling a lot better at the end of the day.

It's not designed for a "quick draw," but while just walking along it works well. Maybe a pocket knife holster would allow for quicker draw. If I see one I like I may try it.

[wissink]

Do you take the camera body off first? I've set my Sigma 100-300 f4 with a arca plate and the Peak Design Clip. I haven't tested it on its own enough, but use it all the time for the camera body. It works better without the grip of course, but I love using the grip and so have to put up with the awkwardness.

I like your idea though. I'm always looking for budget friendly options.

[AggieDad]

The camera body stays attached. All it does is hook the foot of my Bigma so that the weight is on my belt, not my waist. I just put the hook on my belt at the place the camera naturally hangs when it is on a sling. I hope that is clear. It is difficult to take a selfie, but I will try to do so and add it to the post.