This was asked before. I thought that I had some type of color wheel that would convert shades of one color (say red) to color shades of another (maybe blue), Anyhow, I didn't find it so I didn't answer. T
Today, I have a similar idea. Try this link.
http://dmc-usa.com/Conversion-Charts.aspx
It is a list of DMC color families. Pinks are together, greens are together and so forth.
I assume you have a stash of floss
Pattern "suggests" using four different shades of shell pink. Pull those colors out.
Look at the chart. There are something like 9 different baby blues. Pull those colors. Match the shading and keep four of the blues
Keep doing this and your changes should balance out.
Does this make sense to you?
I've never tried this a such an intense project. I think it should work for.
Please let me know what you think.