Glad you were able to figure it out and also get the parts you needed. Not easy task, especially now, while on the road. Thanks for taking the time to update the forum.
When I installed my lithiums I disabled the alternator coach battery charge feature and set the AC input current limit to limit charger current to about 120A into my 600hr install. I've always had the habit of turning off the inverter when changing an AC input (on or off). It always seemed a little extreme to me (since it should be designed to be reliably able to operate that way) but after hearing your story I think you reinforced that behavior. Sometimes I also open the storage bay doors by the inverter to get better airflow at the inverter if batteries are very low and it's going to take several hrs to charge.
BTW, I recently completed a week of dry camping and was really happy with my lithium upgrade. I would run the geni 2-3 hr/day to charge batteries (usually mid day or late PM as it got warm outside so would also run A/C). I was able to easily run on battery until the next day running pretty much any inverter loads I wanted without issues (electronics, microwave, coffee pot, etc). Never used more than 300-400Ahr in a 24hr period.