Tbh u the time you buy all of that you could buy a home battery system that would give you more flexibility and better results. Don’t forget even if you do all of that there’s limits on usage and it’s OK for us who never own the car but if you own it why would you want to take life out of you fifty grand car? It’s a nice idea but looking at the details it’s not really practical. Out of curiosity what is the OP looking to run that means without V2l the Enyaq is out? Just being nosy really. Obviously you’re taking power thru the charging port so you can’t use that power whilst driving. If it’s for charging a decent truse sinewave inverter could do that from 12v if its camping if it were me I’d look at portable power banks some of these now can put out and store a lot of power. I wonder if those options mean you have more choice of car it might be worth considering.
V2H is the easy part as it intergrates through a Bidirection charger with your home/grid (V2x), through the charging port. Think of it as one very big battery storage system.
V2L is essentially the same princple, with the exception it is primarily geared up to power a morowave, toaster fridge, kettle etc. Thats not to say V2L can’t power appliances, charge a home battery or assist with a powercut, within your home or even run the home, becase it can, it just needs to be intergrated in a different way and act more like a generator, incorporating a automatic or manual transfer switch.
Hyundai/Kia for example, also allow you to make use of V2L, whils’t on the move or camping (if thats your forte), by the use of an in cabin socket aswell as the charging port. MG have V2L but I’m not sure if its only from the charge port.
Useing a 12v inverter of the 12v battery in a EV, when there’s a large battery bank available kind of defeats the object and we know EV’s are tempremental with their 12v batteries at the best of times.