You just want the grip and no dovetail plate to go on a tripod head? Or you okay with L bracket kinda accesory? I am a big fan of L brackets built into grip. If I had EM5 mk 3, I will look into this -
https://shop.stcoptics.com/product/fogrip-em5mk3/
I particularly like the Red, blue combo on a silver body. And also Brown/Orange! (But too expensive, new)
Biggest draw of course is the unique folding grip which I feel is a great idea for such smaller bodies where you pinkie just dangles while holding camera.
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*STC is mostly famous for their novel filters that go in front of the sensor and other optics.
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I was going to order a Haoge or whatever from Amazon, but they're out of stock... so I ordered one of these. It's a bit of a tough pill to swallow given it's $145 shipped to the US... but I think the little fold down doohickey will probably help a one-handed grip.
The 5MkIII is fine with the small lenses, but with something like the 12-40 pro on it, it gets too front heavy to be comfortable one-handed.
I'll update once I receive it. I'll be testing it out on my PD Travel Tripod. If all works well, this will be something that will pretty much stay on the camera full-time.