pre-lockdown I was going overseas fairly often and would always disconnect my battery, for up to 3 weeks at a time, and never had an issue.
Make sure the car is unlocked when you disconnect (it will return to the same state when the battery is reconnected), you can of course lock it with the sill buttons, and door lock, after that. And sure, take the EKA procedure/ EKA code with you, but I doubt you'll need it. BTW, the EKA disable feature will ensure that if immobilised the car doesn't DEMAND the EKA, but it will still ACCEPT the EKA, if your key/fob doesn't clear the immobilisation, so still worth keeping the EKA info to hand. If you let the battery go flat while connected then it's pretty much certain that you will get immobilised - and so you may as well disconnect the battery when it's pretty much certain you won't get immobilised/ need the EKA.
I assume you have a working fob and door locks/ microswitches though? If not then all bets are off... Lastly, when you have disconnected the car battery, put the fob somewhere where the lock/ unlock buttons are not going to get pressed (else the fob will lose synch for when you reconnect the battery, and you can't resynch the fob while immobilised).
I've tested all this out on my car (4.6 1998) your model may differ.
If I disconnect the battery is it possible to lock the tailgate?
