Creating synthetic CMYK profiles?

While creating custom or synthetic RGB profiles is pretty straightforward, does anyone here know of any tools to create synthetic *CMYK* profiles? I’m looking for something that will allow specifying of CMYK primaries and secondaries and a customizable TRC and then build an ICC profile. The intent here is to build something like a “reference” or simulation profile for digital press and/or inkjet devices. I’ve gone through all the ISO 15339 CRPC profiles but none of them have the kind of gamut boundaries that I’m looking for.. Only tool that I can think of at the moment is the rather antiquated Custom CMYK tool in that’s been in Photoshop for a very long time…I’m not confident it will give me what I need. Regards, Terry Wyse