Not really an answer to my problem; let’s put if differently:
given a certain CMYK color eg M80Y100 (orange), the main logo-color of my client, which is due to its nature not really vibrant on screen, should keep these values for printing, but when exported as a digital document for screen, it should be converted to a specific RGB color or put hexadecimal: #FF3700
I would like to keep these values in one swatch and when exporting this to other formats, get this converted automatically to this specific color.
I thought I could do something with the ink manager, but this seems limited.