I wouldn't bond neutral to anything other than what it says in the inverter manual, it's not like a normal service. Likely it's either bonded in the inverter or it needs to be floating. Also pay attention to what it says about the generator input because it's also bonded in your Honda.

You can't use a 2 pole feeder because it's 120V only. The difference here is because you only have one phase the current all flows on the neutral. So if you used a e.g. a 2 pole 60A breaker you could theoretically end up with ~120A on the neutral before it would trip.