IIRC there was a rule (B.A.R. ? c.2000 ?) that banned any rotational interconnection between the front wheels
so maybe 2 chassis-mounted axial-flux gearhead machines each with its own driveshaft to its own front wheel
each somewhat integral with its own (inboard) friction brake and clearly common only at the ES
the ES and the CEs and their cooling systems will be bigger ... and again ....
these 'lighter' A-F machines will be harder to accelerate ie 'heavier' (they are bigger stores of mechanical energy)