The Kodak sensor was the same 44x33mm as the Sony sensor used in the 645Z. But it was a CCD sensor, while the Sony is a CMOS sensor. Each has advantages, but when it comes to low-light, low-noise performance, the CMOS wins the day....I can't remember if the old Kodak sensor was full-frame? That would give it an advantage w.r.t. color moire. I remember they used to use a bit different Bayer pattern as well.
I have not tried the Velvia plug-ins that are available, but I think several are available: https://www.fredmiranda.com/VelviaVision/
It is never my objective to make digital look like film. That's like making a CD sound like an LP as an objective. I want both to sound good, and I want the colors and tonality that represents my intentions when using film or digital. Both may arrive at the same spot, or I might have to change directions because of a limitation I did not anticipate.
Rick "who tried those film filters once last year with the new version of DxO Photolab and quickly hit the Undo button" Denney