I just saw an interesting mod to the a2000. Besides making the current sense resistor smaller, they added a pigtail for a 6-pin connector. This should reduce the risk of overdrawing current from the pcie slot. My guess is this could be extended at least to add more +12V leads
The guy is rather skilled and makes it look easy. If you haven’t done lots of soldering, it isn’t as simple as he shows lol