I’m not sure the indie, non megalab chemistry kits ought to be so easily dismissed. I have had fantastic results working with Tetenal Colortec in the past with really not that much more than a shift in the cyan direction. And this was using a kitchen sink for thermal stability.

C41 is such a toilet process anyway — everything is shades of brown?! — that I can’t imagine anyway would look for precise color work from it the same way I can’t imagine anyone would look for resolution for 135 stock.