Seems like not too many people were interested in this. But, I am. A good DC/DC converter is necessary for any EV project and it seems like an often overlooked item. It might be a blessing in disguise that there's no board to replace. It really is more convenient if you can use the existing board if at all possible. That hasn't been fun for the chargers and inverters but I think the DC/DC is probably simple enough that it should work and would allow them to be used as-is. That's a win for everyone.