I don't have an R-D1 but I DO have a 90mm Rokkor f4. It fits on my M3 like a glove so I would assume it would work on your Epson (since they are both M-mounts).
I've been down that road. It's still pretty guestimate with the 135mm finder. You're better off eyeballing it in your VF, get a sense of the area it covers between the brightline frame and the rangefinder patch. In the end, I decided to sell my 90 and shoot wide open and closest with my 50 (to get that OOF background...)
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