Just an FYI, these guys have done something very similar:
http://www.scan-services.net/en
They’re a high end scanning lab in Paris, although their process is slightly different from what you mention (though not by much)
They photographed a colour checker on all the various film stocks they get asked to scan, then had a pro-lab make an RA4 darkroom print for each. The same colour checker negative then gets matched to the print and (if I’m correct in thinking) an ICC profile for each film stock/paper is made and used as a base
For anyone curious about the quality, I had some test scans sent over in various formats both colour and B&W, 35mm, medium format, large format 4x5’s - all amazing. Beats the Imacon system hands down as you get a true RAW file perfectly inverted, for every frame you’ve taken on your shoot, and probably the biggest benefit, it works in Capture One - which is what everyone in the high-end fashion and commercial space use