Cooling an alternator down to ambient vs under hood temperatures seems to be good for around 20 to over 30%:
https://balmar.net/balmar-technology...output-curves/
That's low hanging fruit with a piece of light ribbed hose and perhaps a 3D printed bell mouth intake and some sort of means to distribute the air into the alternator.
It should also help with alternator longevity.
IIRC a good # of cars already do this?