Heres Meritors answer to conversion of busses, commercial trucks.
Electric motors bolted directly to the differential.
3 cables, no drive line.
Just add batteries or hydrogen tanks,
Thomas Busses are already using it in new production.
Look at the weight savings once you get rid of the Transmission, engine, rad.... not to mention the freedom to design something quite different once you eliminate the ICE and all its supporting systems.
I think hybrids are a waste, building BOTH power supply ststems but as a transition while they develop the electric systems they make sense.