If it were just one OBJ export I wouldn’t bother and just edit the values in the MTL.
However, Blender is only one step in the process of our pipeline where we clean up models and set up the materials before they get thrown into Simplygon. I have to export a ton of OBJs which is why it’s not really a feasible workaround, as I would have to pull out a calculator and manually convert all the RGB values for every material of every OBJ that I’m exporting. 