NOTE: Most of the following workflow can be saved as a custom C1 style and then auto-applied on tethered capturing. Frame individual adjustments I consider absolutely necessary are marked with an asterisk.

NOTE 2: By now I‘ve distilled the workflow (and a bit more) into a free helper tool for Capture One Pro on MacOS nicknamed „Analogue Toolbox“. A supporting group has been created at https://www.facebook.com/groups/141662290513120/ . Feel free to join if interested.

Prerequisites (Settings)

• Set Auto-Levels channel mode to „Red, Green and Blue channels“
• Set Auto-Levels clipping to 0.1% for shadows and highlights. Negative material defects or fluff can throw off the Auto-Levels feature. If in doubt try with settings between 0.2 and 0.1 or temporarily crop leaving the defect area outside of the frame and reset the crop after conversion.
• Capture an image from the light source alone without any negative in between. Ensure exposure is on point (+/- 0)
• Create a LCC from it with Color Cast and Enable Uniform Light enabled. Do not enable Dust Removal.
• If your lens has Auto Focus - you might want to use it
• If the negatives arch a bit towards the center try to focus a bit off-center to maximise depth of field.
• When tethering ensure that Orientation is fixed in Next Capture Settings to prevent arbitrary rotation with a downward pointing camera.

Procedure

• Capture the negative. Try to always expose around +/- 0.0 in camera. *
• Set Curve to "Linear Response"
• Apply Lens Correction if available with your lens but apply without vignette correction (handled implicitly by LCC)
• Apply LCC using the previous created LCC image
• Adjust Noise Reduction: Luminance: 0, Details: 50, Color: 40, Single Pixel: 0
• Adjust Sharpening: Amount: 160, Radius: 1, Threshold: 0, Halo: 0
• Optionally auto-whitebalance using unexposed frame
• Invert via RGB Levels: 0 —> 255, 255 —> 0
• Adjust RGB overall gamma (via midpoint marker). Setting it to -0.25 is often enough.
• Crop without leaving any border *
  (You can still remove the crop as last step if desired.)
• Apply Auto-Levels *
• Adjust channel individual Gamma * of red and blue using midpoint adjustment of the respective channels in levels tool. Use only red and blue midtone points! Usually red needs to go into the - area while blue needs to go into the + area. These are very fine slider adjustments. Use a RGB Color Readout picker on middle grey areas to assist. Red -14 & Blue +14 is often a good starting point.
• Apply a Luma-Curve (S-shaped).

* = needs to be handled on a per-image basis.

Optionally

• Export to TIFF, 16-bit, sRGB w/ output sharpening and all metadata
• Apply custom 3D LUT via Affinity Photo, Photoshop or similar LUT capable software (Download Link)
• Convert to SRGB afterwards… and save as JPG

References

DT Culture Heritage: Digitization Workflows: Transmissive 
https://dtculturalheritage.com/product/digitization-workflows-transmissive-pdf-download/