Melexis has several variations on the SOIC8 part now. Some of them are programmable, but they also still have the original ones that aren't programmable. You can follow the formulas in their application note to get you within maybe 10%, and then try it out and calibrate it once. Then, as long as the mechanical things are the same, different sensors will give the same results. I'm using the melexis on that 50kW AC power board with no daughter board. There's bare copper to solder a little rectangle piece of wire on that narrow path to allow the higher current:
