Sometimes you need precision far beyond that of ICC color management.

Sometimes the best solution is a small targeted swatch book of similar colors, from which exact colors can be selected. With a physical book, output from your actual printing equipment, you can count on your accuracy.

Wasatch SoftRIP's Color Neighborhood Analyzer is the tool you need.  Use your spectrophotometer to click on any color, and quickly get a custom swatch book of a hundred similar colors.  Adjust the precision by DeltaE to expand or contract the range of the patches in the swatch book, to suit you needs.   As an alternative, enter CIE color numbers from any source, and use them in the same way.

Print your swatchbook, and make precise selections from actual output.  Color Neighborhood Analyzer is included in every basic subscription to Wasatch SoftRIP.