Looks good. Both approaches will likely work well.
Reality Check and Disclaimer!
This scheme is essentially how I am approaching solar charging. I subscribe to the theory that the solar charger should never be paralleled with the alternator when driving, or with the Xantrex charger when on shore power or generator.
However, many DIY'ers have simply wired the output of their solar charger directly to the house battery terminals and let the solar charger and charge bridge (or BIM) sort out the details for themselves. The theory is that the internal resistance of the batteries will limit charging current, and that the solar charger's charging algorithm will provide just the right amount of voltage and current at the right time, even when a secondary charging source is present.
So, before you go out and buy components, do some more research on this. Particularly since your batteries are AGM. You might be able to save some wiring headaches as well as simplify operation.
There are other issues that you will need to address. For one, the NA has three connections to the negative side of the house battery bank. You will need to come up with a way to install a shunt in the negative connection to monitor battery currents etc. Combining the three connections into one may be a challenge and will probably require you to create a DC distribution bus somewhere in the coach. Look at Victron Lynx Distributor and Victron Lynx Shunt as possible answers.
Chuck and Lynda
2018 NA 3343, 2020 Buick Envision Toad, 1000 watts solar, 900 amp hours LIFePO4 batteries.