Starting in the middle:
"our pipe" ? are you a P1 employee (like Eric Chan is Adobe's) ?
I'm sorry about that. I was certain that I filled in my profile here, but apparently that is not so.
Let me introduce myself then: I am a Phase One engineer in the Image Core group, which is responsible for image processing in Capture One and related products. I currently maintain the color management implementation.
Note the "implementation" part. We have a really critical guy ("The Image Professor") who needs to nod. Unlike me, he has a really good color vision for example.
I am also the one to blame for the current incarnation of the LCC-system, lens correction, most of the local adjustments, certain parts of camera calibration and many other things. I don't touch the GUI at all.
what DNG has to do with all this (we are talking abour C1 and not ACR/LR) and how the pure matrix conversion is negatively affected by a curve(s) applied to demosaicked or not demosaicked data for before using that matrix to do a color transform from a scene referred data into some proper color space ? RPP does exactly that - roughly : wb, curves, etc before demosaick, then demosaick and then color transform as the last stage and pure matrix profiles do work properly... for as long as C1 does not do color transform from camera's "color space" into something else pure matrix profile shall work as intended regardless of whatever curves it applies internally before matrix from profile.
I am saying that your approach will only be useful for a very specific, and extraordinarily dumb, RAW converter.
It will not produce useful profiles for Capture One. I just used DNG-based converters to explain why your approach is useless in that case. However, DNG have a standardized conversion chain, so you could conceivably build profiles that specifically targets that case.
My point is that the ICC-profile is always linked to particular conversion process. I am not saying you cannot force Capture One to use such a profile; you can also force it to use a Trinitron profile (if you know how). I merely said it is useless to do so.
that is not the subject of our discussion - the subject is very simple : whether it is necessary to use C1 to generate a tiff file from a target shot to build a simple matrix profile to be used in ICC or not
OK, so let me put it in simpler terms:
1) Yes, you can easily force Capture One to use a random camera profile.
2) No, it is useless unless the profile-builder have intimate knowledge about the RAW conversion chain.
Esben H-R Myosotis