Are you looking for a hardcase which is attached to the camera such as the Sony LCJ-RXK or will a separate hardcase meet your requirements? I have this case for my RX100 M6 with a AGR2 grip.
https://www.amazon.co.uk/dp/B07G7W88ZV/ref=pe_3187911_189395841_TE_dp_2
It is - as far as I can ascertain - real leather, solidly made, with a quick and easy to use magnetic catch. I use it belt-mounted and can have the camera out of the case and ready for action very rapidly. As far as I am aware it should be OK for the M7 although the website doesn't mention it. As a bonus it's discounted by over £6.0 on the Amazon UK website. J.