Replacing color with specific color

[TanBrae]

I know I can use the color replacement brush tool. Been there, done that. 

My issue is this:  I frequently work with black and white graphics. Up to this point, my workflow has been to remove white, then invert so the image is white. Then, I go to Adjustment Layer and choose Recolor. This works, except if I need to replace the color with a specific hex color. There is no option, and using the sliders isn't very helpful. 

Is there something I'm missing, or is there a better way? For my work, using the color replacement brush isn't very quick, so I'm not keen on that option. I guess I'm thinking it would be nice if I could just type in a hex color in the color picker. 

[NotMyFault]

Assuming you use Photo, and you have pure black / white (not grayscale).

1. add a fill layer and assign color by hex code.
2. rasterize to mask your b/w layer (white takes color, black gives transparency)
3. put mask above fill layer