Well, loneoceans is planning to build a new buck/boost or switching driver and is asking for suggestions HERE. I have already suggested that he make it compatible with Anduril or Narsil, and I think he will. But I also asked if he would use a more modern MCU and port one of those firmware choices to it, and he said it is outside the scope of his project. Still, having a good buck/boost driver compatible with BLF firmware will help with those low Vf emitters.