I have been using a combination of CNC milling and hand painting of Alupanel to get my panels done, mainly because of the cheapness of the panel materials and the fact I have yet to find a decent sub 1mm mill bit to do the text on real hard anodised aluminium. I am only using a cheap-o Sainsmart mill that is more suited to wood and plastic, so I need something that will cut the stuff like butter, or it really complains, but I will definitely give the one you have listed a go, even if I have to stick with the Alupanel and just use it to take away the enamel paint. Your results are just awesome!
Instead I size the text large enough to engrave (which means I have to be very picky about what I actually put on for labels) and mill out to about 0.5mm depth and fill the resuling engraving with oil paint, wiping off the excess from the surrounding panel. I described the whole process over here - Making my Big Button Cartesian Sequencer