Photoshop :: Colorize Setting For Specific Color?

Occasionally I select part of an image, apply a hue/sat adj layer, check colorize and attempt to re-create an RGB color on that selection....but it all seems to be trial and error, hunt and peck method of moving HSL sliders or entering numbers.
 
I tried matching the "numbers" to an HSL equivalent of the desired RGB color but not much better/faster desired results.
 
I realize the image has a range of tonal values so hitting the exact number overall is not do-able using this method, nor is it the goal (otherwise a simple paint bucket fill would work). But at least somewhere in the selection image I'd want to be sure my color is very close.
 
I tried using eye dropper color sample spots (up to 4), which works, but the process is slow and fiddly.
 
My goal is to be able to re-color/colorize part of an image to match an RGB sample color, yet leave the tonal range in the image still looking like it is part of the scene; including shadows and highlights and midtones.