This H2 argument is ridiculous. H2 vehicles are electric vehicles that carry around their own generator powered by H2... So there is only very basic difference between one that carries around stored electrical energy in batteries or stored electrical energy in H2 tanks. Vastly different to a hybrid electric that has a petrol drive and electric drive combination. So you can easily make both vehicles and have the fuel source variation as the engine drive is identical. Its not even as complicated as diesel vs petrol as both cars have the same drive system, an electric engine or engines. H2 fuel cells just have better weight to range profile and faster charging at present. I mean H2 power is really just a 'battery' of H2 instead of lithium or whatever holds a charge. The big issue is that leakage of H2 has to be controlled in a way that it vents to the atmosphere readily and does not build up anywhere. But seriously, we've had LPG cars for ages and although the odd random explosion did occur it was not that dangerous.
A hybrid fuel source of batteries and H2 fuel cells is also a possibility, and that is what most airliner designs seem to be aiming for at the moment.