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.