That looks a lot like the FOGRIP someone in the Oly 100-400 thread linked: https://stcoptics.com/en/fogripforem1mii/I had the Olympus E-M1.2 and its a reasonably comfortable camera considering it's so small. To make it really comfortable I made a hand grip. I made it from brass sheet and Music wire all soldered together. Weigh's around 50g
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I'm thinking of one of them but like my RRS plate to much. I wonder if your style of grip would fit ontop of the RRS plate for the EM1?