Although it's convenient to think of exact contrast steps in the way we used to think of graded papers, the contrast varies continuously.
Consequently, it's possible to print directly with the numbers on the colour head, whatever they may be. If the contrast at say, 30M is too low, then 60M might be better. (These are only example figures of course) If you are printing on the same enlarger, on the same paper(s) it's not difficult to tune your eye to this.
There are tables of equivalents for different enlargers and they are clearly useful, but they are contrived to meet two criteria. Firstly, as you'd expect, to give predictable changes in contrast, but secondly to give constant exposure times in the same way as the under-the-lens filter set. (There are also over-the-lens sets for enlargers with a filter drawer.) In this way, some of the light is necessarily "wasted" to even out the exposure times.
When I was printing regularly in the darkroom, I found it perfectly convenient to print using the filters directly. It has to be said that for radical changes in contrast, a new test-strip is needed, but in my view a radical change in contrast changes the aesthetic values so much that it needs to be treated as a new print.
I've always fancied the Ilford Multigrade head, but it's always seemed just a little bit ahead of what my pocket-money could stand.
Addendum: I forgot to say, the filter values are the same for any kind of colour generation, just as inches are the same on any kind of rule, so any way of creating them should work equally well. Phillips made an enlarger which used complementary colours instead of CMY and it seemed to work well.