I'm just wondering if you've yet tried a really good neck strap - the kind that has a bit of 'give', (but not too much). I find this all I need for my RZ, which I hand-hold all the time. However, the film-advance and shutter cocking mechanism is one action with the RZ so this might make a difference....I had a go with a grip but personally found it was more to think about, not less.....I'd suggest trying one before you part with an amount of money, not such a bit deal if you can find one cheap.