All our loads are on AC Out (off grid mode - i.e. no backfeed on AC IN - VE Multiplus II GX - 5000). Currently have a very manual system, for us, we only need 7.5kw to run the house / day, which is the battery capacity, so have limited AC IN to 10A, which just about charges the house battery fully overnight - the car is on its own consumer unit for charging.
Before christmas (when we needed to topup the house battery during the day), as it was colder / had too much heat loss from house, I just swapped the charger/invertor over manually ( at present currently using a simple 3 pin plug / socket) either from the car, or the mains.
... but am a bit like yourself maybe (the VE Quattro would solve this), it would be desirable to have an automated system, but just at present a manual system suits us just fine in plugging in one or another (its also a bit of a pain, on the cars menu system - i.e. you have to get in (or just push down on the centre of the drivers seat), and then switch it on via the menu. Also 10A is within tolerance on the MG4 @ 2.3Kw, but remember to switch off the aircon, otherwise the display will show 5Kw+
... longer term, im not 100% what to do, as our current system is very dependant on cheap overnight electricity (you can only get octopus at present @12.5p off-peak rate?), which in our case lasts another 18 months, longer term I think we’ll need more battery storage (maybe dont need this as the MG4 covers this!), but getting in solar, which will limit the reliance on the grid to Nov-Feb in the UK.
..... also thinking of trickle charging the house battery on the DC side from the AC230v out of the MG4 - as a trail was thinking on getting RS Stock No.:200-6362, to see whats happens