Just found a great solution for this! Leitax has a mount for Sony E. And it permanently attaches _on top_ of the original mount. So no tearing the lens apart with this, unlike with other Leitax adapters.
So, it will have no extra moving slack! It's attached with screws in the original screw holes. And it's under half the price of a novoflex adapter.
I'll for sure get these for possible R-lenses. No question about it!
Leica-R lenses for Mirrorless cameras