Firstly, welcome to OFPEC, I hope we are able to help you with this and any future editing questions.
To begin with the texture you identified seems to be the correct one, however, I looked at the alpha channel it is using and the lettering is white and the rest is pure black (picture attached).
It also uses an .rvmat (
rvmat)file as well as the texture itself.
The .rvmat:
//Class a10_hud.rvmat{
ambient[] = {0,0,0,5};
diffuse[] = {0,0,0,1};
forcedDiffuse[] = {0.005,0.005,0.005,0};
emmisive[] = {0,20,0,1};
specular[] = {0,0,0,0};
specularPower = 0;
renderFlags[] = {"NoZWrite","NoAlphaWrite","AddBlend"};
PixelShaderID = "Normal";
VertexShaderID = "Basic";
//};
I doubt very much if you will find any relevant textures or texture paths for the hud in the config for the A10.
Presuming you managed to sort this out by editing the files for the A10, there is a high possibility that you would be shut out of many servers that are set to detect changed game files.
Only other hope I can see is if BI know about this and are planning to fix it in the next patch, but I wouldn't count on it.
Any other info needed just ask, I will try to help.
Planck